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1.
《地学前缘(英文版)》2022,13(4):101386
The Songliao Basin in Northeast Asia is the largest and longest-lived rift basin and preserves a near-continuous continental succession of the most of the Cretaceous period, providing great material to investigate the adaption of the terrestrial systems to the Cretaceous greenhouse climate and tectonic events. However, the paucity of precise and accurate radioisotopic ages from the Early Cretaceous strata of the Songliao Basin has greatly held back the temporal and causal correlation of the continental records to the global Early Cretaceous records. Three tuff layers intercalated in the Yingcheng Formation have been intercepted by the SK-2 borehole, which offer excellent materials for radioisotopic dating and calibration of the chronostratigraphy of the Lower Cretaceous sequence of Songliao Basin. Moreover, the Yingcheng Formation recorded the largest and the last of the two major volcanic events in Songliao Basin, which also represents a turning point in the basin evolution history of Songliao from syn-rift stage to post-rift stage. Here we report high-precision U–Pb zircon geochronology by the CA-ID-TIMS technique on three tuff samples from the Yingcheng Formation of the SK-2 borehole in the Songliao Basin to construct a greatly improved, absolute age framework for the Yingcheng Formation and provide crucial age constraints for the Songliao Lower Cretaceous Strata. The new CA-ID-TIMS geochronology constrained the Yingcheng Formation at 102.571 + 0.320/?2.346 Ma to ca. 113 Ma, correlating to the Albian Stage. Combined with the previous published Songliao geochronology, the Quantou Formation is constrained to between 96.442 + 0.475/?0.086 Ma and 91.923 + 0.475/?0.086 Ma; the Denglouku Formation is constrained to between 102.571 + 0.320/?2.346 Ma and 96.442 + 0.475/?0.086 Ma; the age of the Shahezi Formation is estimated at ca. 113 Ma to ca. 118 Ma, which could extend to ca. 125 Ma in some locations in Songliao Basin. The major unconformity between the Yingcheng Formation and the Denglouku Formation, which represents the transition of the basin from syn-rift to post-rift is thus confined to between 102.571 + 0.320/?2.346 Ma and 96.442 + 0.475/?0.086 Ma. This is roughly contemporaneous with the change in the direction of the paleo-Pacific plate motion from west-southwest to north or northwest in mid-Cretaceous, suggesting their possible connections. 相似文献
2.
松辽盆地白垩纪地层时代划分 总被引：9，自引：0，他引：9
松辽盆地经多年来地质生产和科研活动,已经建立了一套完整的地层层序,由下往上为：沙河子组、营城组、登娄库组、泉头组、青山口组、姚家组、嫩江组、四方台组、明水组等９组２７个岩性段。白垩系的上限在明水组和依安组之间,相当于马斯特里赫特阶的顶界,同位素年龄为６６Ｍａ。白垩系的下限在沙河子组和火石岭组之间,相当于贝利亚斯阶的底界,同位素年龄为１４４Ｍａ。松辽盆地白垩系属陆相地层,三分性明显,自然划分为下、中、上三统,这种划分方案正被更多的地质工作者所接受。 相似文献
3.
本文通过对松辽盆地地质条件下铀源条件、矿化异常与后期改造的数据分析与研究,得出以下结论:第一、松辽盆地边缘地区可作为今后地浸砂岩型铀矿找矿和研究工作重点,其中双辽地区和缘庆安地区为重点找矿区。第二、松辽盆地白垩系中泉头组和登娄库组为重点矿化异常层位,白垩系各组段地层中盆地边缘的河流相地层为找寻铀矿的重点对象。 相似文献
4.
5.
Chronostratigraphy and Stratigraphic Classification of the Cretaceous of the Songliao Basin 总被引：3，自引：0，他引：3
Wang Pujun Du Xiaodi Wang Jun Wang Dongpo Geoenergy Department Changchun University of Earth Sciences Changchun Jilin Earth Sciences Department Nanjing University Nanjing Jiangsu 《《地质学报》英文版》1996,70(2):207-218
Isotopic ages of synsedimentary clay minerals were directly determined with the ultrasonicscattering-settlement separation-K-Ar dilution technique. The apparent age of black mudstoneis 123 Ma for the Quantou Formation, 111.9-89.0 Ma for the Qingshankou Formation and77.6-76.8 Ma for the upper part of the Nenjiang Formation. The Rb-Sr isochrone age of themuddy limestone-mudstone sequence of the lower part of the Nenjiang Formation is 81 Ma andthat of the muddy evaporite of the middle part of the Quantou Formation is 122.2 Ma. On thebasis of the above isotopic ages, the authors propose a modified scheme of stratigraphic classifi-cation of the Cretaceous of the Songliao basin. 相似文献
6.
合肥盆地中生代地层时代与源区的碎屑锆石证据 总被引：3，自引：0，他引：3
合肥盆地位于大别造山带北侧、郯庐断裂带西侧,其发育过程与这两大构造带演化密切相关。本次工作对合肥盆地南部与东部出露的中生代砂岩与火山岩进行了锆石年代学研究,从而限定了各组地层的沉积时代,确定了火山岩喷发时间,指示了沉积物的源区。这些年代学数据表明,合肥盆地南部的中生代碎屑岩自下而上分别为下侏罗统防虎山组、中侏罗统圆筒山组或三尖铺组、下白垩统凤凰台组与周公山组(或黑石渡组)与上白垩统戚家桥组,其间缺失上侏罗统。盆地东部白垩系自下而上为下白垩统朱巷组与响导铺组和上白垩统张桥组。该盆地出露的毛坦厂组或白大畈组火山岩喷发时代皆为早白垩世(130～120 Ma)。盆地南部的下——中侏罗统及白垩系源区皆为大别造山带,分别对应该造山带的后造山隆升与造山后伸展隆升。而盆地东部白垩系的源区始终为东侧的张八岭隆起带,后者属于郯庐断裂带伸展活动中的上升盘。 相似文献
7.
营城盆地位于松辽盆地东缘,其地层可与松辽盆地地层对比。营城盆地层序（三级）地层应与松辽盆地Ⅰ-VI和IX、X层序（火石岭组、沙河子组、营城组、登娄库组和泉头组）地层相对应,营城盆地地层应该划分为侏罗系上统火石岭组（J3h）;白垩系下统沙河子组（k1sh）、营城组（k1y）、泉头组（k1q）;第四系（Q）。主要可采工业煤层产在沙河子组。 相似文献
8.
松辽盆地北部铀矿地质研究相对薄弱。本文利用岩心、测井资料,综合运用沉积学、盆地分析、砂岩型铀矿成矿理论,对松辽盆地东北隆起区内的沉积建造特征进行了系统梳理:(1)理清了松辽盆地东北隆起区盆缘的地层结构及含铀含氧水渗入窗口的时空分布特征,绥棱以北嫩江组以下地层整体为超覆结构,仅海伦隆起泉头组在盆缘具有削蚀结构从而具备渗入窗口;而绥棱以南的晚白垩世地层整体在盆缘都呈削蚀结构,均具备窗口。(2)研究区可识别出冲积扇、扇三角洲、曲流河、辫状河、三角洲、滩坝及半深湖—深湖相这7种沉积相类型;在海伦隆起、绥棱背斜、庆安隆起等不同构造单元具有不同的沉积充填样式。(3)探讨了松辽盆地东北隆起区砂岩型铀矿的主攻层位、找矿类型及找矿方向:庆安地区泉头组冲积扇扇中辫状河河道砂体是最有利的勘探对象,其次是铁力地区姚家组的扇三角洲砂体和海伦地区泉头组的辫状河河道砂体,最后是绥棱地区嫩一段的三角洲前缘砂体。该研究可为松辽盆地东北隆起区铀矿勘查突破提供新的找矿思路。 相似文献
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LA-ICPMS U–Pb ages of individual zircon crystals from reworked ash-fall tuff beds in lacustrine strata of the Skunk Ranch Formation, a synorogenic unit deposited in a Laramide intermontane basin in the Little Hatchet Mountains, southwestern New Mexico, indicate an early Maastrichtian depositional age of 71–70 Ma. The dated beds are equivalent to nearby growth strata that are partially cut by, and folded over, a Laramide reverse fault. The strata thus record final displacement on the reverse fault and indicate an early Maastrichtian age for fault offset. The Skunk Ranch Formation was previously interpreted as Eocene in age and inferred to record the second event in a two-stage Laramide deformational history in the mountain range. In addition to significantly condensing the age range of the Laramide section and clarifying stratigraphic correlation in the Little Hatchet Mountains, the new ages of the formation also indicate that Laramide deformation in the range was likely restricted to a single Late Cretaceous episode. 相似文献
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《International Geology Review》2012,54(2):237-261
New stratigraphic and petrographic data and zircon U–Pb geochronology from sandstones and volcanic rocks in the states of Queretaro and Guanajuato in central Mexico indicate an important provenance change between Late Triassic and latest Jurassic–Early Cretaceous time. The Upper Triassic El Chilar Complex consists of pervasively deformed, deep-marine olistostromes, and debris-flow deposits of arkosic and subarkosic composition. Detrital-zircon populations range from latest Palaeoproterozoic (1.65 Ga) to Middle Triassic (240 Ma), all predating the depositional age of the strata. The detrital-zircon populations are similar to those previously reported from turbidites of the Potosi fan complex of north-central Mexico and interpreted as derived from Grenville and Pan-African (Maya block) basement and Permo-Triassic arc of continental Mexico directly to the east of the basin. A single sample with a dominant Proterozoic population at ～1.65–1.30 Ga was likely derived either from the Rio Negro-Juruena province of the Amazonian craton or from a local source in the Huiznopala Gneiss, and indicates that El Chilar strata were likely deposited in the proximal part of a submarine-fan system separate from the Potosi fan.Uppermost Jurassic–Lower Cretaceous strata of the San Juan de la Rosa Formation unconformably overlie the El Chilar Complex and likewise consist of deep-marine olistostromes, slump deposits, debris-flow deposits, and proximal fan-channel fills, but are volcanogenic litharenites with abundant felsic and vitric volcanic lithic fragments. Detrital-zircon populations are dominated by Early Cretaceous grains (150–132 Ma) with no known sources in eastern Mexico. Abundant young grains indicate a maximum depositional age of ～134 Ma (Valanginian–Hauterivian). The San Juan de la Rosa Formation is overlain by deepwater carbonates with interbedded siliciclastic beds of the Peña Azul Formation, which contains detrital-zircon ages as young as ～130 Ma, indicating possible equivalence with similar strata of the Las Trancas Formation, with a maximum depositional age of ～127 Ma and lying to the east in the Zimapan Basin, now part of the Sierra Madre Oriental fold and thrust belt. Decreasing content of volcaniclastic strata eastward indicates a volcanic source to the west. Upper Cretaceous marine strata in the Mineral de Pozos area to the northwest in the state of Guanajuato contain litharenites with a maximum depositional age near 92 Ma, and are thus part of a younger depositional system.Composition and detrital-zircon content of the Upper Triassic and Lower Cretaceous successions in central Mexico indicates an important shift from Gondwanan continental sediment sources in the Triassic to western volcanic sources, probably on the edge of the newly opened Arperos basin, by the end of the Jurassic. This important sediment-dispersal change records the break-up of Pangea and concomitant development of arc-related sedimentary basins on the western edge of Mexico. 相似文献
11.
松辽盆地是在印支运动末期至燕山运动早期形成的大型沉积盆地,其不仅蕴藏丰富的油气资源,也是我国主要的地热资源潜力区。本文以大陆科学钻探松科二井为基础通过建立盆地热导率、生热率、孔隙度等物性柱,分析了盆地深部地温场特征,最后给出了松辽盆地坳陷层控型地热系统的形成机制。松辽盆地物性具有明显的垂向分层特征,按照垂向变化可分为4段,分别为盖层段、储层段、稳态热传导段和基底段。热导率随岩性、沉积时代的不同存在较大的差异,总体上随深度的变大逐渐增大,储层段表现出热导率的快速增长,而基底段则热导率差异性大;生热率在白垩系沉积层总体偏低,表现出“冷壳热幔”的热结构;孔隙度表现为从1800 m到2700 m的储层段快速下降趋势,地层储水能力逐渐变弱。松辽盆地地热系统具有坳陷层控的特点,中、晚侏罗世莫霍面隆起形成的热隆张导致了后期浅部的断陷-坳陷双重结构。在坳陷沉积阶段沉积了河湖相为主的砂、泥岩地层,后期随着地下水的循环补给及聚热作用,在白垩系姚家组、青山口组、泉头组中形成了以砂岩为主且空间上由盆地边缘向盆地中心逐渐变薄的层控型地热系统。寻找高渗透热储层是松辽盆地地热探测的关键,本研究可以为盆地深部找热提供... 相似文献
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松辽盆地北部火山岩锆石SHRIMP测年与营城组时代探讨 总被引：5，自引：1，他引：4
前人对松辽盆地营城组的时代存在不同认识。利用松辽盆地北部徐家围子断陷区营城组广泛发育的中—酸性火山岩取芯资料,开展了详细的火山岩锆石SHRIMP U-Pb年代学研究,结果表明营城组火山岩年龄集中在113—111Ma之间,属于早白垩世晚期的Aptian与Albian界线附近,从而明确该套火山岩应发育在营城组中上部的新认识,并由此说明营城组的顶界已跨入Albian。因此,认为松辽盆地营城组的时代为Hauterivian到Albian。 相似文献
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松辽盆地南部-辽西地区横跨兴蒙-吉黑造山带、华北地台及其北缘的增生带几个大地构造单元。受不同类型基底和区域断裂控制,在辽西盆岭区、松辽盆地区和辽北盆地区发育不同类型的晚三叠世-早侏罗世、中-晚侏罗世、白垩纪盆地,各期盆地间继承性较差,方向性极强。三叠系烃源岩发育程度较差,下侏罗统、下白垩统2套煤系地层是主要烃源岩发育段。侏罗系北票组是朝阳-北票等盆地的重要烃源岩,白垩系烃源岩发育较好,除九佛堂组、沙海组、阜新组3套烃源岩外,义县组发育潜在烃源岩。盆地含油气性评价表明辽北盆地区发育4种不同级别的含油气盆地,其中以陆家堡断陷、钱家店断陷、昌图断陷和茫汉断陷勘探前景最好;辽西地区阜新-义县盆地、朝阳-北票盆地等具有一定的勘探价值。 相似文献
14.
松辽盆地科学钻探工程松科二井东孔上白垩统地球物理测井科学成果 总被引：2，自引：0，他引：2
松辽盆地科学钻探工程是围绕地球深部资源、古环境与古气候等一系列重要地球科学问题而实施的重大科学工程。作为该工程的主体钻孔, 松科二井东孔设计为松辽盆地最深钻孔, 设计深度6 400.0 m, 计划穿透白垩系地层、钻至盆地基底。由于上白垩统井段取心量非常少, 因此地球物理测井的作用尤为重要。该孔正式开钻后, 采用先进的成像测井设备对一开和二开钻井井段(上白垩统井段)先后实施4次裸眼井综合测井和套管井测井作业, 并系统地开展测井综合评价, 取得以下科学成果: (1)原位获取了常规测井、特殊测井和固井质量检查测井资料共20种, 资料丰富、质量优良, 建立了上白垩统连续的岩石物理参数标准剖面; (2)完成了上白垩统地层划分、岩性识别、沉积和构造精细解释; (3)识别出泉头组油气储层、嫩江组和青山口组烃源岩层、嫩江组高放射性异常层, 以及上白垩统地热开发潜力层; (4)探索了青山口组古气候分析的有利测井指标; (5)及时提供准确的井径、钻孔轨迹和固井质量等关键钻探工程信息。研究成果对于松辽盆地地球物理勘探科学“标尺”建立、古环境与古气候研究、钻探工程施工起到至关重要的作用, 为整个钻探工程科学目标的实现奠定良好基础。 相似文献
15.
Liu Zhaojun Wang Dongpo Liu Li Liu Wanzhu Wang Pujun Du Xiaodi Yang Guang Changchun University of Earth Sciences Changchun Jilin Sun Sheping 《《地质学报》英文版》1993,67(2):167-180
The rupture of the lithosphere in Late Jurassic brought about the eruption of basaltic magma in the Songliao Basin. The evolution of the basin in Cretaceous progressed through six stages: pre-rift doming, extensional fracturing, fault subsidence, fault downwarping, downwarping and shringkage, resulting in the deposition of terrstrial facies nearly 10,000 m thick. There are different depositional sequences in these stages: the depositional period of the Early Cretaceous Shahezi and Yincheng Formations is the development stage of the down-faulted basin, forming a volcanic rock-alluvial fan-fan delta-lacustrine (intercalated with episodic turbidites)-swamp facies sequences; the period of the Early Cretaceous Dengluku Formation is the transformation stage of fault subsidence into fault downwarping of the basin, forming a sequence mainly of alluvial plain-lacustrine facies; the depositional period of the Early Cretaceous Quantou Formation-Late Cretaceous Nenjiang Formation is the downwarping stage of the basin, forming an alluvial plain-delta-lacustrine facies sequence; the period of the Late Cretaceous Sifangtai Formation-Mingshui Formation is the shringkage stage of the basin, forming again a sequence mainly of alluvial plain-alluvial fan and small relict lacustrine facies. These vertical depositional sequences fully display the sedimentary characteristics of a failed continental rift basin. Many facts indicate that the two large-scale lake invasions, synchronous with the global rise of sea level, which took place in the downwarping stage of the basin development, led to the connection between the lake and sea. 相似文献
16.
《地学前缘(英文版)》2023,14(3):101527
Songliao Basin, the largest Mesozoic intracontinental nonmarine basin in eastern China, initiated during the latest Jurassic as a backarc extensional basin; rifting failed and thermal cooling controlled subsidence through the early Late Cretaceous. Integrating 2-D and 3D reflection seismic and borehole data with regional geological studies, we interpret sedimentary sequence and structural patterns of the Coniacian-Maastrichtian fill of Songliao Basin as defining a retroforeland basin system developed after 88 Ma (marked by the T11 unconformity in the basin), including (1) significant increase in the thickness of the Nenjiang Formation eastward towards orogenic highlands of the Zhangguangcai Range and the convergent continental margin; (2) a shift of detrital provenance in the basin from north to southeast; and (3) propagation of E-W shortened structures, increasing eastward in amplitude, frequency, and degree of inversion toward the orogen. During latest Cretaceous, foreland basin fill progressively deformed, as the foredeep evolved to a wedge-top tectonic setting, marked by the basin-wide T04 unconformity within the upper Nenjiang Formation at 81.6 Ma. Much of the basin was brought into the orogenic wedge and eroded by the end of the Cretaceous. Late Jurassic/Early Cretaceous backarc rifting of uncratonized basement comprised of accreted terranes likely facilitated and localized the foreland. Synrift normal faults reactivated and extensively inverted as thrust faults are prominent in the eastern 1/3 of the basin, whereas folds developed above detachments in shaley early post-rift strata dominate the western 2/3 of the basin. Songliao foreland development likely was driven by changing plate dynamics and collision along the Pacific margin after 88 Ma. 相似文献
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松辽盆地南部白垩纪-古近纪挤压构造的发现与盆地性质探讨 总被引：1，自引：0，他引：1
松辽盆地位于欧亚板块东部,毗邻太平洋板块,是叠置于华北板块和西伯利亚板块之间的晚古生代碰撞造山带之上规模最大的中-新生代陆相含油气盆地,具有断、坳双重结构。自白垩纪以来,松辽盆地南部主要经历两期挤压作用:NW-SE向挤压作用发生在下白垩统营城组碎屑岩段-上白垩统泉头组沉积时期,挤压作用持续了18Myr;近E-W向挤压作用发生在四方台组-古近系沉积时期,挤压作用至少持续了39.1Myr。两期挤压作用都表现出东强西弱的特点,第二期挤压作用的变形强度远大于第一期,并且在明水组沉积晚期变形强度最大,这期挤压作用奠定了松辽盆地现今的构造格局。下白垩统营城组上部碎屑岩段-上白垩统泉头组和四方台组-古近系的沉积作用分别记录了第一期、第二期挤压作用形成的反转构造和断层相关褶皱的变形过程。上述构造在不同时期隆升速率与沉积速率之间的关系,控制了盆地的沉积范围、沉积地层的厚度和接触关系在空间上的变化。松辽盆地在上述两个构造演化阶段都处于活动大陆边缘的陆内区域,盆地性质都应属于陆内挤压坳陷盆地。 相似文献
19.
ZHANG Jiaodong CHEN Xuanhu LI Qiuli LIU Chengzhai LI Bing LI Jie LIU Gang REN Fenglou 《《地质学报》英文版》2012,86(5):1060-1076
The Hefei Basin is the largest basin in the North China landmass with complete and well-preserved Mesozoic and Cenozoic strata. In the basin there developed a suite of extremely thick “red beds” in the Mesozoic. Owing to complex evolution processes and a lack of paleontological traces, there have been controversies regarding the division and correlation of this suite of red beds. Based on results obtained in recent years in drilling, seismic and surface geological investigations and in consideration of relationships between seismic sequences and regional tectonic events, as well as evidence in paleontology, petrology and isotopic dating, this paper preliminarily puts forward the following ideas about the sequence stratigraphic framework of the continental “red beds” in the Hefei Basin. (1) The Zhougongshan Formation and the Yuantongshan Formation have similar lithologic, geophysical and paleontological characteristics, so we incorporate them into a single formation, called the Yuantongshan Formation, and the original Zhougongshan and Yuantongshan Formations are regarded as the upper and the lower parts of the newly defined Yuantongshan Formation. Its age is the Middle Jurassic; (2) the Zhuxiang Formation belongs to the Upper Jurassic Series and (3) the age of the Xiangdaopu Formation is the Lower Cretaceous. Furthermore, signatures of depositional evolution are analyzed in the paper based on features of seismic reflection, outcrops and drilling data. The Early and Middle Jurassic is characterized by a foreland basin, which is influenced mainly by uplift and longitudinal compression of the Dabieshan Mountains; the Lower Jurassic System has a relatively small depositional area; the Middle Jurassic strata are distributed extensively over the whole basin, marking the summit of basin development; a flexure basin is characteristic of the Late Jurassic, manifesting a joint effect of the Dabieshan and Zhangbaling Mountains with the former being more significant. In the Early Cretaceous, the Xiangdaopu Formation was distributed in the Daqiao depression, evidently affected by extension of the Tanlu fault; in the Late Cretaceous, the Hefei Basin was subjected to dismembering and the Zhangqiao Formation was distributed in the east-west direction along the downthrown side of the fault. 相似文献