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排序方式： 共有106条查询结果，搜索用时 31 毫秒
1.
巴布亚湾受澳大利亚板块与太平洋板块高速斜向汇聚的控制,经历了复杂的中、新生代构造演化.前人对巴布亚湾盆地结构构造特征的研究多是局部的、分散的,关于盆地的形成时间和动力学机制仍存在争议.利用覆盖全盆的钻井约束的高精度2D、3D地震资料,精细地刻画了盆地的结构和构造特征,揭示了巴布亚湾发育潘多拉和奥雷两期叠置的前陆盆地.潘多拉前陆盆地是形成于渐新世不整合面之上的晚渐新世-中中新世微型前陆盆地,走向为NNE.奥雷前陆盆地是发育在复杂的裂谷边缘之上的早中新世-现今的周缘前陆盆地,沿着弧形的巴布亚半岛延伸480 km;盆地走向在148°E发生转变,由西部的NW向转为东部的近EW向.潘多拉微前陆盆地被奥雷前陆盆地向南逐渐超覆的沉积地层覆盖,两个前陆盆地走向相互垂直,垂向上形成叠置结构.阐明了巴布亚湾新生代经历三期挤压事件及两期叠置的前陆盆地的形成演化,解决了盆地结构及区域构造演化认识的不足,理清了复杂陆缘环境从伸展到挤压多期构造事件的时序及动力学机制,为澳大利亚板块北缘的板块构造重建提供了盆内证据. 相似文献
2.
桑托斯盆地裂陷初期岩浆活动与储层发育关系密切。本文以盆地L区块火成岩-介壳灰岩复合体为研究对象,通过对火成岩岩石学、年代学测试及钻井、测井资料分析等,首次明确了桑托斯盆地裂陷初期岩浆活动特征及其对介壳灰岩沉积过程的控制,并指出介壳灰岩储层的分布特征。L区块内火成岩分属晚白垩世Santonian期—Campanian期和早白垩世Aptian两期岩浆活动产物,并以Aptian期为主,至少经历了7次不连续喷发和3次侵入过程,形成了块状玄武岩、杏仁状玄武岩和玻基斑状玄武岩(含再沉积玻基斑状玄武岩)等喷发相火成岩和以辉绿岩(局部属粗玄岩)、煌斑岩形式产出的侵入相火成岩。Aptian期岩浆多期活动重塑了古地貌,形成了局部构造凸起,促成并控制了下白垩统Itapema组至少6期介壳灰岩沉积,最终形成了～620 m厚火成岩-介壳灰岩复合体。介壳灰岩储层呈透镜体形状,以“散点式”不连续分布在Aptian期盆内古隆、古断阶(坡)等区域,横向连续性差,垂向连通性受限,其发育规模和质量受古地貌及水深条件等影响。 相似文献
3.
正20140805Fan Baocheng(Xi’an Center of Geological Survey,China Geology Survey,Xi’an710054,China);Meng Guanglu The Geological Evolution and Metallization of TalasKalatawu Block in Northern Tianshan,Kyrgyzstan(Northwestern Geology,ISSN1009-6248,CN61-1149/P,46(2),2013,p.54- 相似文献
4.
Samuele Papeschi Giovanni Musumeci Hans-Joachim Massonne Francesco Mazzarini Eric James Ryan Giulio Viola 《Journal of Metamorphic Geology》2020,38(5):495-525
The Acquadolce Subunit on the Island of Elba, Italy, records blueschist facies metamorphism related to the Oligocene–early Miocene stages of continental collision in the Northern Apennines. The blueschist facies metamorphism is represented by glaucophane- and lawsonite-bearing metabasite associated with marble and calcschist. These rock types occur as lenses in a schistose complex representing foredeep deposits of early Oligocene age. Detailed petrological analyses on metabasic and metapelitic protoliths, involving mineral and bulk-rock chemistry coupled with P–T and P–T–X(Fe2O3) pseudosection modelling using PERPLE_X, show that the Acquadolce Subunit recorded nearly isothermal exhumation from peak pressure–temperature conditions of 1.5–1.8 GPa and 320–370°C. During exhumation, peak lawsonite- and possibly carpholite- or stilpnomelane-bearing assemblages were overprinted and partially obliterated by epidote-blueschist and, subsequently, albite-greenschist facies metamorphic assemblages. This study sheds new light on the tectonic evolution of Adria-derived metamorphic units in the Northern Apennines, by showing (a) the deep underthrusting of continental crust during continental collision and (b) rapid exhumation along ‘cold’ and nearly isothermal paths, compatible with syn-orogenic extrusion. 相似文献
5.
FSRU在恶劣环境条件下的作业和安全停靠性能与系泊缆张力、靠垫挤压应力、船体6自由度运动等参数有关。针对FSRU码头处海洋环境条件,进行FSRU不同装载状况的模型实验,获得FSRU的6自由度运动及其系泊载荷的动力特性。基于三维辐射和绕射理论,使用Sesam软件进行频域计算,以此为基础在相应海洋环境条件下进行时域耦合分析,获得FSRU 6自由度运动、系泊载荷、靠垫应力等参数的响应时历。结果表明:30%装载、横浪条件下FSRU的运动响应最大,系泊缆张力未达到破断值,靠垫压力超过其压缩60%时的载荷;模型实验对FSRU运动响应和系泊缆张力的预测结果可信,靠垫受力情况需要数值仿真进行辅助研究。 相似文献
6.
Lower Oligocene-Miocene rock salt is exposed in several diapirs in the central plateau of Iran along the northern margin of the Great Kavir basin. These include a small but mature salt extrusion known as Qum Kuh located near the city of Qum. We use small-baseline interferograms to study the surface displacements of Qum Kuh. The interferometric dataset consisted of 149 interferometric displacement maps derived from 35 C-band ASAR images collected by Envisat satellite in both descending and ascending orbits from 2003 through 2009.The results of the displacement time series analyses show significant long-term trend of horizontal motion toward gentle slopes of Qum Kuh, punctuated by seasonal variations during dry and wet seasons. Interferometric Synthetic Aperture Radar (InSAR) time series results suggest that the salt near the spreading center, where the salt first surfaces from depth, is extruded to the more gentle flanks of Qum Kuh and that down-slope gravitational spreading of the extruded salt accelerates when it is wet. 相似文献
7.
Kazuaki Okamoto 《Island Arc》1998,7(1-2):283-294
The orientation of straight inclusion trails within albite porphyroblasts from basic schists has been measured around a north-closure fold, in the Besshi district of the Sambagawa Belt, central Shikoku, Japan. The porphyroblasts are aligned with their longest dimension parallel to both the subhorizontal, east–west-directed mineral lineation and to the fold axis. There is a systematic variation in inclusion-trail geometry between the upper (northern) and lower (southern) fold limbs. The shear sense deduced from quartz c-axis fabrics is top-to-the-west in the upper limb and top-to-the-east in the lower limb. Based on observed variations in porphyroblast inclusion trails, the structural history can be modelled as follows: (i) shear flow caused east–west stretching and folding of the metamorphic zonation; (ii) east–west ductile shear resulted in opposing senses of shear in the upper and lower limbs as the eclogite body situated in the core of the fold was extruded to the east. 相似文献
8.
大陆动力学的理论与研究开启了人们一个新的思路:在确认中国大陆构造格架、划分构造单元时,除了前寒武纪基底、南华-印支期生物地层格架以外,不能不考虑中-新生代以来重大的陆内变形事件所产生的陆内变形(大型走滑断裂、推覆构造、挤出构造)对印支与前印支期所形成大陆构造格架大幅度的改造,因此对前印支期构造单元的性质需要通过构造复位来重新认识.通过构造复位认为:阿拉善、中祁连-柴达木、北羌塘等微陆块和塔里木板块是一个整体的克拉通--西域板块,不存在整体的昆(仑)-祁(连)-秦(岭)海洋板块,早古生代满加尔-北祁连坳拉槽-小洋盆和晚古生代东昆仑-阿尼玛卿-金沙江裂陷洋盆可能是由古特提斯洋脊楔入所引起的,类似于现今的红海-亚丁湾.本文拟从阿拉善、北羌塘地块的构造归属、西域板块的确认:中国境内北亚构造域的构造划分和晚侏罗-早白垩世陆内变形、中亚挤出构造;中朝与扬子-华南板块划分和南北黄海、朝鲜半岛的构造归属等方面,来讨论有关中国及邻区大陆构造格架的一些争议问题. 相似文献
9.
Tectonic evolution of the ultrahigh-pressure (UHP) and high-pressure (HP) metamorphic belts from central China 总被引：28，自引：0，他引：28
Abstract In the Triassic suture between the Sino-Korean and Yangtze cratons, the Dabie metamorphic Complex in central China includes three tectonic units: the northern Dabie migmatitic terrane, the central ultrahigh-P coesite- and diamond-bearing eclogite belt, and the southern high-P blueschist-eclogite belt. This complex is bounded to the north by a north-dipping normal fault with a Paleozoic accretionary complex and to the south by a north-dipping reverse fault with Yangtze basement plus its foreland fold-and-thrust sequence. Great differences in metamorphic pressure suggests that these units reached different depths during metamorphism and their juxtaposition occurred by wedge extrusion of subducted old continental fragments. These units were subsequently subjected to (i) Barrovian type regional metamorphism and deformation at shallow depths; (ii) intrusion of Cretaceous granitic plutons; and (iii) doming and segmentation into several blocks by normal and strike-slip faults. A new speculative model of tectonic exhumation of UHP rocks is proposed. 相似文献
10.