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1.
Anna Alexandra Vackiner Philipp Antrett Frank Strozyk Stefan Back Peter Kukla Harald Stollhofen 《International Journal of Earth Sciences》2013,102(6):1701-1716
This study presents a reconstruction of the tectonic history of an Upper Rotliegend tight gas field in Northern Germany. Tectonism of the greater study area was influenced by multiple phases of salt movement, which produced a variety of salt-related structural features such as salt walls, salt diapirs as well as salt glaciers (namakiers). A sequential 2D retro-deformation and stratal backstripping methodology was used to differentiate mechanisms inducing salt movement and to discuss their relation to regional tectonics. The quantitative geometric restoration included sedimentary balancing, decompaction, fault-related deformation, salt movement, thermal subsidence, and isostasy to unravel the post-depositional tectonic overprint of the Rotliegend reservoir rock. The results of this study indicate that reactive salt diapirism started during an Early Triassic interval of thin-skinned extensional tectonics, followed by an active diapirism stage with an overburden salt piercement in the Late Triassic, and finally a period of intensive salt surface extrusion and the formation of salt glaciers (namakiers) in Late Triassic and Jurassic times. Since the Early Cretaceous, salt in the study area has been rising by passive diapirism. 相似文献
2.
渤海海域莱州湾凹陷盐构造成因探讨 总被引：5，自引：4，他引：1
通过分析莱州湾凹陷盐构造特征,盐构造形成动力条件,探讨莱州湾凹陷盐构造成因,讨论了走滑背景下盐岩活动特点。分析表明,莱州湾凹陷盐层构造发育刺穿性盐株和枕状底辟,欠压实、超压破裂、潜伏走滑断层和楔形体的重力扩张促使了莱州湾凹陷盐岩早期流动;渐新世右行走滑阶段,走滑压扭作用下形成刺穿盐株;盐构造活动可分为沙三末期-沙一段沉积期盐流动阶段、中晚渐新世东营沉积时期盐刺穿阶段、中新世-第四纪盐构造再次活化三个阶段。走滑断裂作用下盐岩以流动为主,发育典型的刺穿型盐底辟。 相似文献
3.
Martin Bak Hansen Holger Lykke-Andersen Ali Dehghani Dirk Gajewski Christian Hübscher Morten Olesen Klaus Reicherter 《International Journal of Earth Sciences》2005,94(5-6):1070-1082
A dense grid of multichannel high-resolution seismic sections from the Bay of Kiel in the western Baltic Sea has been interpreted
in order to reveal the Mesozoic and Cenozoic geological evolution of the northern part of the North German Basin. The overall
geological evolution of the study area can be separated into four distinct periods. During the Triassic and the Early Jurassic,
E–W extension and the deposition of clastic sediments initiated the movement of the underlying Zechstein evaporites. The deposition
ceased during the Middle Jurassic, when the entire area was uplifted as a result of the Mid North Sea Doming. The uplift resulted
in a pronounced erosion of Upper Triassic and Lower Jurassic strata. This event is marked by a clear angular unconformity
on all the seismic sections. The region remained an area of non-deposition until the end of the Early Cretaceous, when the
sedimentation resumed in the area. Throughout the Late Cretaceous the sedimentation took place under tectonic quiescence.
Reactivated salt movement is observed at the Cretaceous Cenozoic transition as a result of the change from an extensional
to compressional regional stress field. The vertical salt movement influenced the Cenozoic sedimentation and resulted in thin-skinned
faulting. 相似文献
4.
The study provides a regional seismic interpretation and mapping of the Mesozoic and Cenozoic succession of the Lusitanian Basin and the shelf and slope area off Portugal. The seismic study is compared with previous studies of the Lusitanian Basin. From the Late Triassic to the Cretaceous the study area experienced four rift phases and intermittent periods of tectonic quiescence. The Triassic rifting was concentrated in the central part of the Lusitanian Basin and in the southernmost part of the study area, both as symmetrical grabens and half-grabens. The evolution of half-grabens was particularly prominent in the south. The Triassic fault-controlled subsidence ceased during the latest Late Triassic and was succeeded by regional subsidence during the early Early Jurassic (Hettangian) when deposition of evaporites took place. A second rift phase was initiated in the Early Jurassic, most likely during the Sinemurian–Pliensbachian. This resulted in minor salt movements along the most prominent faults. The second phase was concentrated to the area south of the Nazare Fault Zone and resulted here in the accumulation of a thick Sinemurian–Callovian succession. Following a major hiatus, probably as a result of the opening of the Central Atlantic, resumed deposition occurred during the Late Jurassic. Evidence for Late Jurassic fault-controlled subsidence is widespread over the whole basin. The pattern of Late Jurassic subsidence appears to change across the Nazare Fault Zone. North of the Nazare Fault, fault-controlled subsidence occurred mainly along NNW–SSE-trending faults and to the south of this fault zone a NNE–SSW fault pattern seems to dominate. The Oxfordian rift phase is testified in onlapping of the Oxfordian succession on salt pillows which formed in association with fault activity. The fourth and final rift phase was in the latest Late Jurassic or earliest Early Cretaceous. The Jurassic extensional tectonism resulted in triggering of salt movement and the development of salt structures along fault zones. However, only salt pillow development can be demonstrated. The extensional tectonics ceased during the Early Cretaceous. During most of the Cretaceous, regional subsidence occurred, resulting in the deposition of a uniform Lower and Upper Cretaceous succession. Marked inversion of former normal faults, particularly along NE–SW-trending faults, and development of salt diapirs occurred during the Middle Miocene, probably followed by tectonic pulses during the Late Miocene to present. The inversion was most prominent in the central and southern parts of the study area. In between these two areas affected by structural inversion, fault-controlled subsidence resulted in the formation of the Cenozoic Lower Tagus Basin. Northwest of the Nazare Fault Zone the effect of the compressional tectonic regime quickly dies out and extensional tectonic environment seems to have prevailed. The Miocene compressional stress was mainly oriented NW–SE shifting to more N–S in the southern part. 相似文献
5.
Termit盆地及其周缘是中西非裂谷中典型的中、新生代裂谷盆地,也是中石油海外最具潜力的风险勘探区,但由于多期构造运动的复杂性,研究区晚白垩世的古地理演化缺乏系统的分析研究。本文将Termit盆地及其周缘作为研究区域,在构造演化的基础上利用地球化学、地层学及地球物理等手段进一步分析了研究区的古沉积环境、古气候及古物源,最终明确了晚白垩世的古沉积演化。研究认为,晚白垩世早期的森诺曼阶（Cenomanian）研究区开始发生海侵,三冬阶（Santonian）时期达到最大海侵范围,之后开始逐渐海退的过程。马斯特里赫特阶（Maastrichtian）时期的区域构造挤压事件使盆地形态发生改变,该构造事件最终以区域不整合结束。地球化学资料、岩性资料以及地震资料综合表明,森诺曼阶（Cenomanian）-三冬阶（Santonian）时期研究区处于偏还原的浅海陆架沉积,属典型的热带气候,接受来自北东向的物源供给;至坎潘阶（Campanian）-马斯特里赫特阶（Maastrichtian）时期,伴随着海平面的下降,研究区由海相沉积逐渐转变为海陆过渡相沉积,且物源主要来自于北东及南西两个方向。本次研究明确了Termit盆地及其周缘在晚白垩世的古沉积演化过程,这为进一步明确研究区的沉积体系及砂体的预测提供了理论依据。 相似文献
6.
东秋里塔格构造带位于库车前陆盆地的南缘,新生代经历了强烈的构造挤压和构造沉降。平衡剖面分析、生长地层识别和重点井沉降史的数值模拟表明:古新-始新世库姆格列木群沉积期间构造活动微弱并沉降缓慢。渐新世苏维依组沉积期间,构造活动开始加强,沉降速度加快,并形成了一些小断距的逆断层。中新世构造活动进一步加强,沉降加速,沉积了厚层的吉迪克组膏盐层;康村组沉积时期,构造挤压使得膏盐层发生塑性流动,形成盐枕,康村组发育生长地层。随后的上新世库车组沉积期间,研究区先发生快速沉降,然后,随着南天山急剧隆升,冲断作用迅速向南扩展。约在早更新世,库车褶皱冲断带前锋到达东秋里塔格构造带,并最终定型,使得该区发生强烈的构造变形,形成大量的逆冲断裂构造带,膏盐层表现出明显的塑性流动,形成盐推覆构造。 相似文献
7.
K. P. Yampol’sky 《Geotectonics》2011,45(2):113-126
The Knipovich Ridge extends for 550–600 km between the Mohns Ridge and the demarcation Spitsbergen Fracture Zone. The structural
features of this ridge are repeatedly mentioned in the literature; however, substantial discrepancies remain in the treatment
of its tectonics. New data on the structure of this ridge presented in this paper are based on the results of continuous seismic
profiling in the area studied by the expedition of the Geological Institute, Russian Academy of Sciences and the Norwegian
Petroleum Directorate on the R/V Akademik Nikolaj Strakhov in 2006; 56 seismic lines allow us to depict zones differing in seismic records that provide insights into their internal
tectonic structure. Interpretation of the seismic data makes it possible to compile maps of the acoustic basement surface
and sedimentary cover thickness in the studied area. These maps expand our knowledge of the geological history and geodynamics
of the Knipovich Ridge at the neotectonic stage of its evolution. 相似文献
8.
The NW–SE-striking Northeast German Basin (NEGB) forms part of the Southern Permian Basin and contains up to 8 km of Permian to Cenozoic deposits. During its polyphase evolution, mobilization of the Zechstein salt layer resulted in a complex structural configuration with thin-skinned deformation in the basin and thick-skinned deformation at the basin margins. We investigated the role of salt as a decoupling horizon between its substratum and its cover during the Mesozoic deformation by integration of 3D structural modelling, backstripping and seismic interpretation. Our results suggest that periods of Mesozoic salt movement correlate temporally with changes of the regional stress field structures. Post-depositional salt mobilisation was weakest in the area of highest initial salt thickness and thickest overburden. This also indicates that regional tectonics is responsible for the initiation of salt movements rather than stratigraphic density inversion.Salt movement mainly took place in post-Muschelkalk times. The onset of salt diapirism with the formation of N–S-oriented rim synclines in Late Triassic was synchronous with the development of the NNE–SSW-striking Rheinsberg Trough due to regional E–W extension. In the Middle and Late Jurassic, uplift affected the northern part of the basin and may have induced south-directed gravity gliding in the salt layer. In the southern part, deposition continued in the Early Cretaceous. However, rotation of salt rim synclines axes to NW–SE as well as accelerated rim syncline subsidence near the NW–SE-striking Gardelegen Fault at the southern basin margin indicates a change from E–W extension to a tectonic regime favoring the activation of NW–SE-oriented structural elements. During the Late Cretaceous–Earliest Cenozoic, diapirism was associated with regional N–S compression and progressed further north and west. The Mesozoic interval was folded with the formation of WNW-trending salt-cored anticlines parallel to inversion structures and to differentially uplifted blocks. Late Cretaceous–Early Cenozoic compression caused partial inversion of older rim synclines and reverse reactivation of some Late Triassic to Jurassic normal faults in the salt cover. Subsequent uplift and erosion affected the pre-Cenozoic layers in the entire basin. In the Cenozoic, a last phase of salt tectonic deformation was associated with regional subsidence of the basin. Diapirism of the maturest pre-Cenozoic salt structures continued with some Cenozoic rim synclines overstepping older structures. The difference between the structural wavelength of the tighter folded Mesozoic interval and the wider Cenozoic structures indicates different tectonic regimes in Late Cretaceous and Cenozoic.We suggest that horizontal strain propagation in the brittle salt cover was accommodated by viscous flow in the decoupling salt layer and thus salt motion passively balanced Late Triassic extension as well as parts of Late Cretaceous–Early Tertiary compression. 相似文献
9.
Yuriy Maystrenko Ulf Bayer Magdalena Scheck-Wenderoth 《International Journal of Earth Sciences》2005,94(5-6):799-814
The salt tectonics of the Glueckstadt Graben has been investigated in relation to major tectonic events within the basin.
The lithologic features of salt sections from Rotliegend, Zechstein and Keuper show that almost pure salt is prominent in
the Zechstein, dominating diapiric movements that have influenced the regional evolution of the Glueckstadt Graben. Three
main phases of growth of the salt structures have been identified from the analysis of the seismic pattern. The strongest
salt movements occurred at the beginning of the Keuper when the area was affected by extension. This activation of salt tectonics
was followed by a Jurassic extensional event in the Pompeckj Block and Lower Saxony Basin and possibly in the Glueckstadt
Graben. The Paleogene–Neogene tectonic event caused significant growth and amplification of the salt structures mainly at
the margins of the basin. This event was extensional with a possible horizontal component of the tectonic movements. 3D modelling
shows that the distribution of the initial thickness of the Permian salt controls the structural style of the basin, regionally.
Where salt was thick, salt diapirs and walls formed and where salt was relatively thin, simple salt pillows and shallow anticlines
developed. 相似文献
10.
11.
Although it has long been recognised that passive salt diapirism may encompass sub-ordinate cycles of active diapirism, where sedimentary overburden is periodically shed off the roof of the rising salt, there has been very little study of this process around exposed salt (halite) diapirs. However, the Late Miocene-Pliocene Sedom salt wall, on the western side of the Dead Sea Basin, presents an opportunity for detailed outcrop analysis of diapiric salt and the associated depositional and deformational record of its movement during both passive and active phases of diapirism. The sub-seismic scale record of diapirism includes sedimentary breccia horizons interpreted to reflect sediments being shed off the crest of the growing salt wall, together with exceptional preservation of rotated unconformities and growth faults. Areas of more pronounced dips directed towards the salt wall are capped by unconformities, and interpreted to represent withdrawal basins within the overburden that extend for at least 1500 m from the salt margin. Elsewhere, broad areas of upturn directed away from the salt extend for up to 1250 m and are marked by a sequence of rotated unconformities which are interpreted to bound halokinetic sequences. The margins of the salt wall are defined by steep extensional boundary faults that cut upturned strata, and have enabled rapid and active uplift of the salt since the Holocene. The Sedom salt wall therefore charts the transition from passive growth marked by withdrawal basins, growth faults and unconformities, to more active intrusion associated with major boundary faults that enable the rapid uplift of overburden deposited on top of the salt to ∼100 m above regional elevations in the past 43 ka. Individual cycles of passive and active diapirism occur over timescales of <30 ka, which is up to an order of magnitude less than typically suggested for other settings, and highlights the dynamic interplay between salt tectonics and sedimentation in an environment undergoing rapid fluctuations in water level. 相似文献
12.
《Journal of African Earth Sciences》2007,47(1):9-29
In the Halk el Menzel area, the proximal- to pelagic platform transition and related tectonic events during the Upper Cretaceous–Lower Miocene have not been taken into adequate consideration. The integrated interpretation of outcrop and subsurface data help define a seismic stratigraphic model and clarify the geodynamic evolution of the Halk el Menzel block. The sedimentary column comprises marls and limestones of the Campanian to Upper Eocene, overlain by Oligocene to Lower Miocene aged siliciclastics and carbonates.Well to well correlations show sedimentary sequences vary considerably in lithofacies and thicknesses over short distances with remarkable gaps. The comparison of sedimentary sequences cut by borehole and seismic stratigraphic modelling as well help define ten third order depositional sequences (S1–S10). Sequences S1 through S6 (Campanian–Paleocene) are mainly characterized by oblique to sigmoid configurations with prograding sedimentary structures, whereas, sequences S7–S10 (Ypresian to Middle Miocene) are organized in shallow water deposits with marked clinoform ramp geometry. Sedimentary discontinuities developed at sequence boundaries are thought to indicate widespread fall in relative sea level. Angular unconformities record a transpressive tectonic regime that operated from the Campanian to Upper Eocene.The geometry of sequences with reduced thicknesses, differential dipping of internal seismic reflections and associated normal faulting located westerly in the area, draw attention to a depositional sedimentary system developed on a gentle slope evolving from a tectonically driven steepening towards the Northwest.The seismic profiles help delimit normal faulting control environments of deposition. In contrast, reef build-ups in the Eastern parts occupy paleohighs NE–SW in strike with bordering Upper Maastrichtian-Ypresian seismic facies onlapping Upper Cretaceous counterparts.During the Middle–Upper Eocene, transpressive stress caused reactivation of faults from normal to reverse play. This has culminated in propagation folds located to the west; whereas, the eastern part of the block has suffered progressive subsidence. Transgressive carbonate depositional sequences have predominated during the Middle Miocene and have sealed pre-existing tectonic structures. 相似文献
13.
The Salinas de Añana diapir is located in the Basque-Cantabrian basin part of the great evaporite basin, along with the Gulf of Mexico and the Central European basin, when the fragmentation of Pangea started. The evolution of these basins can only be achieved by understanding the control of salt in the sedimentary and tectonic evolution of these basins.Sedimentation began with clastic Buntsandstein sediments and minor Muschelkalk limestones. Subsequent Keuper evaporites are the bottom of sedimentary cover constituted by Jurassic limestones and marls, a clastic Lower Cretaceous and an alternant limestone and marl Upper Cretaceous, whose deposition has been conditioned by salt tectonics. The emplacement of salt extends from the Aptian until now, favored by the duplication of the salt thickness associated with the thrust of Sierra Cantabria, so it is an excellent example to study changes in the regime of intrusion along the time. The geodynamic evolution of the Salinas de Añana diapir was determined through the interpretation of 45 reprocessed seismic lines, along with information from three wells. Migration of the salt in this diapir, conditioned by N120E and N30E pre-Alpine basement lineations, was determined using time isopach maps of the various rock layers. Vertical evolution of the diapir was determined through the reconstruction of a north-south section at various geologic times by flattening the respective seismic horizons. A minimum of salt flow into the diapir coincides with a minimum rate of sedimentation during the Turonian. Similarly, maximum flows of salt into the diapir occurred during the Coniacian and Lower Santonian and again from the end of the Lower Miocene to the present, coinciding with maximum rates of sedimentation during these times. In the Tertiary, probably during the Oligocene, the diapir was displaced to the south by the Sierra Cantabria thrust, maintaining the contact between the evaporites of diapir and the same evaporites of the lower block. Since the Oligocene, the salts of the lower block migrated towards and into the diapir, deforming the trace of the overthrust. 相似文献
14.
Transpressional tectonics characterizes the SW Japan arc. However, we will show in this article that offshore seismic profiles and onshore mesoscale faults indicate that the eastern part of the forearc was subject to transtensional tectonics since ca. 2.0 Ma. Offshore normal faults imaged on the profiles run parallel to the Nankai Trough, and started activity at 1.0 Ma, but transtensional tectonics commenced the onshore area earlier. In order to understand the stress history in the forearc region, we collected fault-slip data from onshore mesoscale faults in Plio-Pleistocene sedimentary rocks in the Kakegawa area at the northeastern extension of the offshore normal faults. Most of the mesoscale faults are oblique-normal, indicating that the area was subject to transtensional tectonics. The faults suggest that the compressional tectonic regime was followed by the transtensional one at 2.0 Ma, in agreement with regional tectonostratigraphic data, which indicate that folding ceased at that time. Present compressional stress followed the transtensional tectonic regime sometime in the late Pleistocene. Transtensional or extensional tectonic zone shifted from the Kakegawa area to the offshore region.These observations indicate that the state of stress just behind the accretionary prism of the eastern Nankai subduction zone has been unstable in the last 2 million years, suggesting that the forearc wedge has been at critical state in that gravitational force and basal shear traction on the wedge have been balanced, but the forearc tectonics has been susceptible to small perturbations. Possible factors compatible with the observed stress history include the change of subduction direction of the plate at 1.0 Ma, and the rapid uplift of Central Japan thereafter. 相似文献
15.
中国南方二叠纪层序岩相古地理特征及演化 总被引：23，自引：3，他引：20
在层序地层研究基础上,以沉积体系域和相关界面为编图单元,采用体系域压缩法和瞬时作图法,以油气勘探为目标,有针对性的编制了中国南方二叠纪11张层序岩相古地理图。在此基础上,全面系统地阐述了该区二叠纪层序岩相古地理特征及演化。结果表明,中国南方二叠纪层序古地理演化具有明显的继承性、不均一性、阶段性、方向性和同步性。与传统的岩相古地理图相比,层序岩相古地理图具有动态、精确、等时、成因连续和勘探实用等优点。 相似文献
16.
Gabor Tari Rudi Dellmour Emma Rodgers Chloe Asmar Peter Hagedorn Adel Salman 《Arabian Journal of Geosciences》2016,9(10):570
A variety of distinct salt tectonic features are present in the Sab’atayn Basin of western Yemen. Based on the interpretation of regional 2D seismic reflection data and exploration wells in the central part of the basin, an Upper Jurassic evaporite formation produced numerous salt rollers, salt pillows, reactive, flip-flop, and falling diapirs. Due to regional extension, halokinetics began as soon as the early Cretaceous, within just a few million years after the deposition of the Tithonian Sab’atayn evaporite sequence, by formation of salt rollers. The salt locally formed salt pillows which evolved to reactive and active salt diapirs and diapiric salt walls as the result of renewed, but low-strain extension in the basin. Some of the diapiric walls further evolved into falling diapirs due to ongoing extension. As the result of a prominent extensional episode at the end of the Cretaceous, many of the diapiric walls in the basin are controlled by large normal faults on their updip flanks. As the post-Cretaceous sedimentary cover is largely missing in the study area, the assumed reactivation of salt structures during the Cenozoic remains poorly constrained. The interpreted changes in the style of salt tectonics in the Sab’atayn Basin offer a better understanding of the regional-scale tectonic development of the Arabian plate during the late Jurassic and Cretaceous. 相似文献
17.
G. A. Belenitskaya 《Geotectonics》2016,50(3):244-256
The paper is devoted to salt tectonics in marginal oceanic salt-dome basins and is based on a wide synthesis of the literature and the author’s data. For the first time, the general pattern of global distribution of these basins has been illustrated by a map. Their localization and structure, tectonic position and evolution, and peculiar morphokinematic features of salt tectonics are characterized and compared with the attributes of salt tectonics inherent to continental regions. The geodynamic settings of the initial formation of marginal oceanic basins and their present-day arrangement have been refined, as well as the onset of salt tectonics therein, manifested in various styles. It has been shown that the geodynamic type of basin and stages of its geodynamic evolution determine the morphokinematic type of salt tectonics, character of its manifestation, and dislocations in host sedimentary complexes, and, therefore, they are auxiliary indicators of geodynamic regimes. The mechanisms of salt tectonics, its effect on the structure of overlying sedimentary sequences, and localization of hydrocarbon fields are discussed. 相似文献
18.
19.
Dorra Tanfous Amri Mourad Bédir Mohamed Soussi Hajer Azaiez Lahoussine Zitouni M. Hédi Inoubli Kamel Ben Boubaker 《Comptes Rendus Geoscience》2005,337(7):703-711
Seismic and sequence stratigraphy analyses, petroleum-well control and surface data studies of the Majoura–El Hfay region in the Central Atlas of Tunisia had led to identify and calibrate Jurassic seismic horizons. Seismic stratigraphic sections, seismic tectonics analyses, isochron and isopach mapping of Jurassic sequences show a differentiated structuring of platform and depocentre blocks limited by deep-seated NE–SW, north–south east–west and NW–SE faults intruded by Upper Triassic salt. The early salt migration seems to have started by the platform fracturing during the Lower Liassic rifting event. These movements are fossilized by thickness variations of Jurassic horizons, aggrading and retrograding onlap and toplap structures between subsiding rim-syncline gutters and high platform flanks intruded by salt pillows and domes. The salt migration is also attested by Middle and Upper Jurassic space depocentre migrations. Around the Majoura–El Hfay study blocks bounded by master faults, Triassic salt have pierced the Cretaceous and Tertiary sedimentary cover in a salt diapir extrusion and salt wall structures. To cite this article: D. Tanfous Amri et al., C. R. Geoscience 337 (2005). 相似文献
20.
Seismic reflection data are used to investigate the structure of block
of the Norwegian sector of the North Sea, situated in the Norwegian—Danish Basin. Zechstein (Upper Permian) salt occurs in this basin, having given rise to widespread and intense salt tectonics.A number of reflections can be recognized and identified on the seismic sections. They are the Top Oligocene, the Top Paleocene, the Base Tertiary, and the Top Lower Cretaceous reflections, as well as a Jurassic reflection and the Base Permian Salt reflection (only found locally).The geological structure of the area is illustrated by means of seismic contour maps and cross-sections.Three salt plugs (a northern, a central and a southern one) are present in block 8/8. Two of these pierce Base Tertiary. The third (southern) one is more deep-seated. A major growth fault connects the northern and central plugs. The southern salt plug is surrounded by a rim syncline.The movements on the major fault and in the salt plugs in the course of geological time are investigated. It is found that there is evidence for movement in Late Jurassic, Cretaceous and Tertiary times until at least Early Miocene times.The possible cause of the structure of block
is considered in detail. It is found that the movement of the salt in at least the central salt plug is intimately connected with movements on the major growth fault. The hypothesis is advanced that all local tectonic movements are due to the flow of salt and a scheme for this salt flow is proposed. A number of special features of the tectonics of the area which support this concept are dis- cussed.Volumetric considerations are also used. The approximate volume of the salt in the plugs as well as the volume of salt drained from part of the area are calculated. Finally, deep reflection evidence is used to estimate the depth of the base of the Zech- stein salt and the top of the crystalline basement in the southern part of the area. 相似文献