The Fault Block's Framework in Boli Basin and its Control Over the Deposition   总被引：2，自引：0，他引：2  

Cao Chengrun  Shan Xuanlong  Wang Dongpo 《东北亚地学研究》2001,(1)

IntroductionBoli basin, in the east of Heilongjiang Province,is an arc basin protruding southwards which ispressed by two region81 lithospheric fau1t zones:Yishu fault zone and Dunmi fault zone (Wan Tian-feng, l996). The basin is about 240km long and60km …  相似文献   

塔里木西北部乌什—柯坪—巴楚地区古生代沉积—构造演化及成盆动力学背景沉积—构造演化及成盆动力学背景   总被引：1，自引：1，他引：0       下载免费PDF全文

吴根耀  李曰俊  刘亚雷  赵岩 《古地理学报》2013,15(2):203-218

把柯坪断隆“还原”为塔里木板块的一部分,重塑了它与北邻的乌什地区和南邻的巴楚地区古生代“分分”“合合”的演化史,得到以下重要认识。（1）奥陶纪在乌什、柯坪和巴楚一间房地区发育以东西向的古吐木休克断层为南界的台盆;该断层的西段后期被柯坪塔格断裂（东西走向段）迁就利用,中—东段后期因被肢解而“消失”。（2）柯坪地区最西部中泥盆世已有海相沉积,晚泥盆世—石炭纪海侵不断向东扩展;因南天山洋的消减在柯坪—阿克苏—库车一线形成横贯塔里木北缘的石炭纪隆起带,使得塔里木中—北部上泥盆统—石炭系的沉积相有清楚的空间展布规律。（3）据同位素年龄值将柯坪地区东段玄武岩的时代更正为早二叠世,强烈火成活动造成的热隆升使该地区早二叠世即出现陆相沉积;塔西北的其他地区石炭纪末—早二叠世普遍发生海侵。（4）从与南天山洋和西昆仑洋耦合演化的角度简要探讨了塔里木西北地区古生代的成盆动力学背景,认为古生代有东西向、北西向及北东向的控盆和控相断裂发育并总结了其后期演化的特点。  相似文献   

青藏高原新生代隆升研究现状   总被引：5，自引：1，他引：4  

张克信  王国灿  洪汉烈  徐亚东  王岸  曹凯  骆满生  季军良  肖国桥  林晓 《地质通报》2013,32(1):1-18

新生代青藏高原的隆升过程倍受世界关注。国内外学者从不同角度围绕青藏高原成为统一整体(印度-欧亚碰撞)的时限、隆升阶段性和空间差异性、青藏高原作为高海拔高原形成的时间、青藏高原隆升的动力机制等重大事件进行了深入的研究。对印度板块-欧亚板块的碰撞时间存在70Ma、65Ma、55Ma、50Ma、45Ma和40～34Ma等多种观点。印度板块与欧亚板块碰撞不是在某个时间点完成的,其碰撞持续时间约10～15Ma。碰撞方式存在由西向东迁移、由东向西迁移等多种观点。青藏高原的隆升过程具有强烈的时空差异性。青藏高原新生代隆升阶段存在多种划分方案,流行的有3阶段、4阶段和5阶段强隆升过程。青藏高原作为高海拔高原形成的时间可归纳为约3.6Ma以来、13～8Ma、26～20Ma、40～35Ma和55～45Ma 5类观点。青藏高原的形成机制模型存在较大分歧,流行的模式可分为碰撞、俯冲、挤出和拆沉-板片断离4类。青藏高原多阶段隆升及构造-岩浆演化造就了高原复杂多样的大陆成矿作用。高原隆升与环境和气候演变具耦合关系。  相似文献   

青藏高原始新世构造岩相古地理     

宋博文  张克信  梁银平  王国灿  徐亚东  陈锐明  骆满生  陈奋宁 《地质通报》2013,32(1):56-66

在前人研究成果的基础上,分析青藏高原始新世残留盆地的构造背景、岩石地层序列和青藏高原始新世期间的构造岩相古地理特征。松潘-甘孜和冈底斯带为大面积构造隆起蚀源区,塔里木东部、柴达木、羌塘、可可西里地区主体表现为大面积的构造压陷湖盆-冲泛平原沉积,高原西部和南部为新特提斯海。从构造岩相古地理演化的角度揭示青藏高原始新世构造隆升与沉积响应的耦合关系,划分出2个强隆升期,分别是强隆升期Ⅰ(55-51Ma)和强隆升期Ⅱ(45-34Ma)。  相似文献   

The Sedimentary Record in Northern Qaidam Basin and its Response to the Uplift of the South Qilian Mountain at around 30 Ma     

SONG Bowen  ZHANG Kexin  CHEN Ruiming  WANG Chaowen  LUO Mansheng ZHANG Jianyu  JIANG Shangsong 《《地质学报》英文版》2013,87(2):528-539

The thick, Eocene to Pliocene, sedimentary sequence in Qaidam Basin at the northern margin of the Tibetan Plateau records the surface uplift history of the northeastern Tibetan plateau. In this study, we present detailed geochemistry, heavy mineral, and clay mineralogy data of the well preserved sedimentary record in the Dahongou section in the northeast of the Qaidam Basin. The results suggest that the sedimentary sequence recorded a 30 Ma young uplift/unroofing event in the northern edge of the Qaidam Basin, which is characterized by high ZTR index value and chlorite content, and low CIW`. The results are consistent with previous sedimentological studies of the Qaidam Basin, which indicated rapid increase of the accumulation rates around 30 Ma. Based on past thermochronological data from the mountains around the Qaidam Basin and the accumulation rates of the Cenozoic basins in the northeastern Tibetan Plateau, we infer a regional uplift and denudation event along the northeastern Tibetan Plateau during early Oligocene (～30 Ma), indicating that the Tibetan Plateau had expanded north-eastward of the study area at that time.  相似文献   

Cooling History of a Crustal Section in Eastern Tibet (Well HC1) Constrained by Thermochronology     

Peter J.J. KAMP  LIU Shugen  XU Ganqing  LI Zhiwu  Martin. DANISIK  DENG Bin 《《地质学报》英文版》2013,87(Z1):57-58

  相似文献   

The Deep Velocity Structure and Crustal Flow Beneath the Eastern Margin of the Tibetan Plateau   总被引：1，自引：0，他引：1  

ZHU Jieshou  JIANG Xiaotao  FAN Jun  LIANG Chuntao 《《地质学报》英文版》2013,87(Z1):435-438

  相似文献   

Control factors on turbidite sedimentation in a deep-sea trench setting. – The example of the Schlieren Flysch (Upper Maastrichtian-Lower Eocene,Central Switzerland)     

Wilfried Winkler 《Geodinamica Acta》2013,26(2):81-102

Abstract

Deep-sea turbidite sedimentation in convergent margin settings generally is controlled by tectonic uplift, climate and eustatic sea-level variations. The rate of tectonic uplift governs the relief of the source area and the position of the base level (coinciding with sea-level), climate influences the rate and style of weathering and continental runoff and eustatic seal-level additionally shifts the base level, functioning with the concurrently working tectonic movements. Thus, these factors primarly determine the availability of sediment (yield and nature of material and the site of intermittent storage) at the basin margin which is unlocked periodically to flow downslope to the basin.

This paper attempts to decipher quantitatively the importance of the individual factors in the Late Maastrichtian to Early Eocene Schieren Flysch Croup. The flysch was deposited in a moderately converging remnant oceanic trench basin. Mean parameters are calculated on the basis of formations and the duration of nannofossil zones comprised in. For transposing these zone into absolute age intervals the problem of inconsistent durations in current time scales had to be solved by a best-fit approach. Frequencies and periodicities of turbidite events, decompacted and compacted sedimentation rates (the latter are considered as apparent denudation rates) are calculated to reveal the dynamics of sedimentation. Climatic evidence is deduced from clay mineralogy. Changing uplift rates in the drainage area are indirectly interpreted from back-stripped tectonic subsisdence rates in the basin.

The obtained data point to an immediate control of sub-duction-Iinked tectonic uplift in the bordering drainage and shelf area on turbidite sedimentation, as frequency and thickness of the turbidite events are closely correlated with the increasing tectonic subsisdence in the basin (assumed to match the rate of subduction and underplating). This general trend is modified by the temporary migration of the oceanic hinge zone towards the trench causing periodically the starvation of outer portions of the basin at the transition from Early to Late Paleocene and Late Paleocene to Eocene. Regional climatic trends additionnaly rule the turbidite facies development and apparent denudation rates. In the upper part of Early Eocene series high rate mud dominated sediments correlate with warm/humid conditions and in Late Paleocene deposits low rate sandy sediments coincide with cool ones. During the Late Paleocene period the global 2nd-order sea-level lowering probably may be responsible for the by-passing of the shelf by the coarse grained sediments.  相似文献   

桂东大瑶山地区铜金多金属成矿系列及成矿模式①     

邓军 《矿产与地质》2013,(1):8-11

大瑶山地区铜金多金属矿床主要由斑岩型、矽卡岩型、断裂-蚀变岩型等三种类型的矿床(点)组成,矿种以金为主,伴有铜、银、铅、锌等矿化,构成一个较完整的成矿系列组合,可划分出2个矿床成矿系列和4个矿床成矿亚系列。成矿作用与浅成-超浅成岩浆岩关系密切,岩浆活动为矿床的形成提供了热源和热液;断裂构造提供了运移通道并控制着矿体分布;震旦系-寒武系是主要矿源层。建立了矿源层、构造、岩浆活动“三位一体”的区域成矿模式。  相似文献   

Geomorphic constraints on the Late Neogene tectonics of the Otway Range,Victoria   总被引：1，自引：1，他引：0  

M. Sandiford 《Australian Journal of Earth Sciences》2013,60(1):69-80

A Pliocene strandline system in the Hanson Plain Sands, between the volcanic plains of the Western District and the northern flanks of the Otway Range in southwest Victoria, provides an excellent datum against which to measure Late Neogene fault‐related uplift. Individual strandlines that can be traced from elevations of ～120 m near Cobden to ～245 m on the Ferguson Hill structure are displaced across northeast‐trending faults and monoclines associated with the Simpson and Ferguson Hill structures. A break in slope in the Otway Range front at elevations of 230–280 m, beneath which drainage incision parallels the trends of the strandlines, probably correlates with the Pliocene coastline on the ancestral Otway Range. By analogy with correlative systems in the Murray Basin, deposition occurred during sea‐stands between 0 and 65 m above present‐day sea‐level, implying uplift of between 175 and 240 m since the Early Pliocene. Enhanced incision parallel to the strandlines, in combination with tilting of fault blocks about northeast axes at a high angle to the strandlines, has facilitated the development of a remarkable rectilinear drainage net. Local inversion of the drainage where it focused basalt flows constrains the age of incision and faulting to greater than ca 1 Ma and, most probably, less than ca 2 Ma.  相似文献