检索结果-南通市图书馆

The influence of Cretaceous paleolatitude variation of the Tethyan Himalaya on the India-Asia collision pattern

Science China Earth Sciences 2017年第6期60卷 1057-1066页

作者： ZHANG Ye HUANG BaoChun key laboratory of orogenic belts and crustal evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China

Identifying when, where, and how India and Asia collided is a prerequisite to better understand the evolution of the Himalayan-Tibetan Plateau. Whereas with essentially the same published paleomagnetic data, a large range of different India-Asia collision models have been proposed in the literature. Based upon the premise of a northwards-moving Indian plate during the Cretaceous times, we analyze the significant variations in relative paleolatitude produced by a nearly 90° counterclockwise(CCW)rotation of the plate itself during the Cretaceous. Interestingly, recent studies proposed a dual-collision process with a Greater India basin or post-Neo-Tethyan ocean for the India-Asia collision, mainly in the light of divergent Cretaceous paleolatitude differences of the Tethyan Himalaya between the observed values and expected ones computed from the apparent polar wander path of the Indian plate. However, we find that these varied paleolatitude differences are mainly resulted from a nearly 90° CCW rotation of a rigid/quasi-rigid Greater Indian plate during the Cretaceous. On the other hand, when the Indian craton and Tethyan Himalaya moved as two individual blocks rather than a united rigid/quasi-rigid Greater Indian plate before the India-Asia collision, current available Cretaceous paleomagnetic data permit only multiple paleogeographic solutions for the tectonic relationship between the Indian plate and the Tethyan Himalayan terrane. We therefore argue that the tectonic relationship between the Indian plate and the Tethyan Himalayan terrane cannot be uniquely constrained by current paleomagnetic data in the absence of sufficient geological evidence, and the so-called Greater India basin model is just one of the ideal scenarios.

关键词： India-Asia collision model Tethyan Himalaya Apparent polar wander (APW) path Paleolatimde Vertical-axis rotation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Raman Scattering Spectroscopy of Phase Transition in n-Pentadecane under High Temperature and High Pressure

引用

Chinese Physics Letters 2009年第1期26卷 55-57页

作者：乔二伟郑海飞徐备 key laboratory of orogenic belts and crustal evolution (Ministry of Education) School of Earth and Space Sciences Peking University Beijing 100871

The Raman spectroscopy of n-pentadecane is investigated in a moissanite anvil cell at normal temperatures and a diamond anvil cell under pressure to about 3000MPa and at temperature from 298 to 573K. Result indicates that at room temperature the vibration modes, assigned to the symmetric and asymmetric stretching of CH3 and CH2 stretching, shift to higher frequency and display a pressure dependent quasi-linear curve. A liquid-solid phase transition appears at a pressure of 150 MPa. The high temperature solidus line of n-pentadecane follows a quadratic function of P = 0.02369T^2 - 9.117T ＋ 725.58, in agreement with previous conclusion derived from studies of other hydrocarbons. Upon phase transition, fitting the experimental data obtained in a temperature range of 283 553 K to the Clausius-Clapeyron equation allows one to define the thermodynamic parameters of n-pentadecane of dP/dT = 0.04738T - 9.117.

关键词： field emission molybdenum dioxide enhancement factor

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Late Permian to Triassic intraplate orogeny of the southern Tianshan and adjacent regions, NW China

引用

Geoscience Frontiers 2014年第1期5卷 83-93页

作者： Wei Ju Guiting Hou School of Earth and Space Science Peking University the key laboratory of orogenic belts and crustal evolution Ministry of Education

The South Tianshan Orogen and adjacent regions of Central Asia are located in the southwestern part of the Central Asian orogenic Belt. The formation of South Tianshan Orogen was a diachronous, scissors-like process, which took place during the Palaeozoic, and its western segment was accepted as a site of the final collision between the Tarim Craton and the North Asian continent, which occurred in the late Palaeozoic. However, the post-collisional tectonic evolution of the South Tianshan Orogen and adjacent regions remains debatable. Based on previous studies and recent geochronogical data, we suggest that the final collision between the Tarim Craton and the North Asian continent occurred during the late Carboniferous. Therefore, the Permian was a period of intracontinental environment in the southern Tianshan and adjacent regions. We propose that an earlier, small-scale intraplate orogenic stage occurred in late Permian to Triassic time, which was the first intraplate process in the South Tianshan Orogen and adjacent regions. The later large- scale and well-known Neogene to Quaternary intraplate orogeny was induced by the collision between the India subcontinent and the Eurasian plate. The paper presents a new evolutionary model for the South Tianshan Orogen and adjacent regions, which includes seven stages：（I） late Ordovician-early Silurian opening of the South Tianshan Ocean; （11） middle Silurian-middle Devonian subduction of the South Tianshan Ocean beneath an active margin of the North Asian continent; （111） late Devonian-late Carboniferous closure of the South Tianshan Ocean and collision between the Kazakhstan-Yili and Tarirn continental blocks; （IV） early Permian post-collisional magmatism and rifting; （V） late Permian-Triassic the first intraplate orogeny; （Vt） Jurassic-Palaeogene tectonic stagnation and （VII） Neocene-Quaternary intraplate orogeny.

关键词： Central Asian orogenic Belt Northern Xinjiang South Tianshan Ocean Tectonics Tarim-North Asia collision

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Local Statistical Structural Model for Amorphous Solids

引用

Chinese Physics Letters 2013年第12期30卷 87-90页

作者： SUN Qiang key laboratory of orogenic belts and crustal evolution(Ministry of Education) School of Earth and Planetary SciencesPeking UniversityBeijing 100871

From Raman spectroscopic study on OH stretching bands,the local statistical interpretation for water structure is *** to the closely structural relationship between amorphous solids and liquids,the structural model is extended to investigate the amorphous solids,which indicates that various intensity of potential can be expected around an atom(molecule).From this,a local statistical order parameter is proposed to understand the short-range order and long-range *** order parameter is influenced by the cooling rate in the glass formation,which means that glass is formed with a slower cooling rate,and has higher structural *** amorphous solids,the geometric topology is closely related to chemical bonding type,such as covalent bond and metallic bond.

关键词： amorphous solids structural

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A New Zosterophyll Plant,Ramoferis ***.,from the Posongchong Formation of Lower Devonian (Pragian) of Southeastern Yunnan,China

引用

Acta Geologica Sinica(English Edition) 2011年第4期85卷 765-776页

作者： HAO Shougang XUE Jinzhuang key laboratory of orogenic belts and crustal evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China

A new genus and species,Ramoferis amalia *** ***.,is described from the Early Devonian（Pragian）Posongchong Formation,Wenshan district of southeastern Yunnan,*** plant has isodichotomous major axes,which also divide anisotomously distally to produce closely spaced lateral branches,often within fertile *** stalked round to reniform sporangia,borne laterally and spirally over several levels of branches,are distantly to moderately spaced or aggregated into distinct *** stalks increase in width from the base to the sporangial junction resulting in a gradual transition between sporangium and *** with known zosterophylls shows that this plant is most similar to the genera Zosterophyllum and Wenshania,differing in the character combinations of sporangial shape,sporangium/stalk junction,stalk dimensions and orientation,and especially in both sterile and fertile branchlets being borne within the fertile *** addition,the observation and comparison indicate distinct variety in structure of sporangial border and suggest that the two-layered sporangium wall characterized by outer anticlinal layer and inner periclinal layer might represent potential synapomorphies,while the different dehiscence mechanism is an autapomorphy for each taxon in zosterophylls.

关键词： zosterophyll Early Devonian Posongchong Flora Yunnan

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

New indicators from bedding-parallel beef veins for the fault valve mechanism

引用

Science China Earth Sciences 2015年第8期58卷 1320-1336页

作者： ZHANG Bo YIN CongYuan GU ZhiDong ZHANG JinJiang YAN ShuYu WANG Yang the key laboratory of orogenic belts and crustal evolution School of Earth and Space SciencesPeking University Exploration & Production Research Institute SINOPEC

Beef structures(bedding-parallel veins of fibrous calcite)are widespread within the Lower Triassic carbonate rocks in the Sichuan Basin of China,especially within clay-rich strata of low *** the veins,fibrous calcite occurs in the outer zones,and coarse equant calcite in the inner *** least two generations of calcite crystallization took place during aqueous alteration,at the same time as deformation recorded by the *** first-generation calcite fibers are at steep angles to the hydrocarbon-bearing host beds,and they grew vertically against the force of gravity at a time when the source rocks were ***-generation calcite occurs as coarse equant grains that sealed pores via localized fluid flow during horizontal tectonic compression,so that shear stresses acted at the fracture *** of the host rock was accommodated in part by dissolution-precipitation creep(DPC),grain rotation,and grain slippage,recorded in crystallographic preferred orientations(CPOs)of the host calcite grains beside the crack *** beef veins formed during high pore-fluid overpressures along *** propose that the bedding-parallel veins with beef structures are evidence of a"crack-seal slip"fault valve process during hydrocarbon *** hydrocarbon-bearing calcite beef structure may be a good indicator of oil or gas migration,and of the flow direction of aqueous solutions.

关键词： calcite vein beef structure crack-seal slip EBSD carbonate rock Sichuan Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Conglomerates and sandstones from the Yintun Formation in Northern Liaoning Province： Implications for the Huronian Glaciation and reconstruction of the Columbia supercontinent

引用

Science Bulletin 2016年第17期61卷 1384-1390页

作者： Liyang Zhang Bei Xu Zhiwen Luo Wen Liao key laboratory of orogenic belts and crustal evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China

New U-Pb zircon geochronology data suggest that the Yintun Formation is younger man ~ 1895 Ma and is late *** Yintun Formation may represent the first sedimentary cover of the North China Craton(NCC)based on its stratigraphic sequence and the ages of its *** in the conglomerates from the lower member of the Yintun Formation are characterized by obvious glacial *** is possible that these glacial gravels are the re-deposited sedimentary products of the Huronian Glaciation from the Indian *** can also provide sedimentary evidence for the relative location of the Indian continent and the NCC in the reconstruction of the Columbia supercontinent.

关键词： Yintun Formation Huronian Glaciation Columbia supercontinent

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phylogeny of Devonian Lycopsids Inferred from Bayesian Phylogenetic Analyses

引用

Acta Geologica Sinica(English Edition) 2011年第3期85卷 569-580页

作者： XUE Jinzhuang the key laboratory of orogenic belts and crustal evolution School of Earth and Space Sciences Peking University Beijing 100871 China

To investigate the phylogeny of early lycopsids,cladistic analyses using both parsimony and Bayesian approaches are presented,with a data matrix of 33 morphological characters across 25 taxa. The resulting parsimony and Bayesian trees showed overall similarities in tree *** the Bayesian tree,the Protolepidodendrales and the heterosporous lycopsids are recognized as two monophyletic groups,and within the latter group,the Isoetales sensu lato forms a *** topology implies that the acquisition of a ligulate character evolved twice in the lycopsids,once in the protolepidodendralean Leclercqia Banks et al.,and once in the heterosporous lycopsid clade. Phylogenetic positions of several lycopsid plants previously reported from the Mid-Upper Devonian of South China,which have uncertain ordinal affinities,were estimated by the cladistic analyses;cf. Longostachys Xue et Hao,Longostachys Zhu et al.,Monilistrobus Wang et Berry,and Yuguangia Hao et *** well within the Isoetales clade,as earliest members of this order,while Minostrobus Wang and Wuxia Berry et *** nested within the basal part of the heterosporous *** analyses are a very useful approach in systematic studies and can be applied in analyzing paleobotanical data sets as well.

关键词： Bayesian phylogenetics cladistic analysis lycopsid Protolepidodendrales Devonian

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Petrogenesis and significance of the Hongshan syenitic pluton,South Taihang: zircon SHRIMP U-Pb age, chemical compositions and Sr-Nd isotopes

引用

Progress in Natural Science:Materials International 2006年第2期16卷 192-200页

作者： ZHOU Ling and CHEN Bin (key laboratory of orogenic belts and crustal evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China) [a]key laboratory of orogenic belts and crustal evolution MOE School of Earth and Space Sciences Peking University Beijing China

The Hongshan syenitic pluton (South Taihang) is mainly made up of hornblende syenite and minor granite. SHRIMP zircon dating yields a U-Pb age of 135±2.7 Ma for the emplacement of the pluton, while biotite Rb-Sr isotopic data give an isochron of 120. 3±2.4 Ma. Hongshan syenites show low silica, high alkalis and LILE such as Sr, and exhibit negligible Eu anomalies or slightly positive anomalies in the REE patterns. The syenites show quite enriched isotopic compositions with Isr from 0.7052 to 0. 7102 and εNd(t) from -7.5 to - 11.1. Petrogenesis of the pluton can be that partial melting of an enriched lithospheric mantle gave birth to an alkali basaltic magma, which subsequently underplated in the lower crust and experienced a coupled fractionation of ferromagnesian phases like pyroxene and hornblende and minor (<10 %) contamination of lower continental crust, producing the Hongshan syenites that partially e-volved into granite through combined fractionation of hornblende and feldspar. Our data are not in agreement with a previous model that the syenites originated from melting of lower crust in a thickened crust circumstance, and thus do not support the speculation of "East China Plateau" in the Mesozoic.

关键词： syenite zircon SHRIMP Nd-Sr isotopes Taihang North China craton.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Mesozoic and Cenozoic uplift and exhumation of the Bogda Mountain,NW China: Evidence from apatite fission track analysis

引用

Geoscience Frontiers 2015年第4期6卷 617-625页

作者： Wenhao Tang Zhicheng Zhang Jianfeng Li Ke Li Zhiwen Luo Yan Chen the key laboratory of orogenic belts and crustal evolution Ministry of Education Department of Geology School of Earth and Space Sciences Peking University

Apatite fission track （AFT） analysis on samples collected from a Paleozoic series is used to constrain the cooling history of the Bogda Mountain, northwest China. AFT ages range from 136.2 to 85.6 Ma and are younger than rock depositional ages and the mean confined track lengths （11.0 13.2 μm） mostly showing unimodal distribution are shorten, indicating significant track-annealing. Thermal histories modeling based on the distribution of fission-track lengths combined with the regional geological data show that two rapid cooling phases occurred in the latest Jurassic-early Cretaceous and the Oligocene-Miocene. Those new data together with previous published data show that the AFT ages become younger from the southwest to northeast in the western Bogda Mountain and its adjacent areas. The fission-track ages of the southwest area are relatively older （〉100 Ma）, recording the earlier rapid uplift phase during the late Jurassic-Cretaceous, while the ages in the north pied- mont of the Bogda Mountain （namely the northeast part） are younger （〈60 Ma）, mainly reflecting the later rapid uplift phase in the Oligocene-Miocene. The trend of younger AFT ages towards the northeast might be explained by post-Cretaceous large-scale crustal tilting towards the southwest. In the thrust fault-dominated northern limbs of the Bogda Mountain, AFT ages reveal a discontinuous pattern with age-jumps across the major fault zones, showing a possible strata tilting across each thrust faults due to the thrust ramps during the Cenozoic. The two rapid uplift stages might be related to the accretion and collision in the southern margin of the Asian continent during the late Jurassic and late Cenozoic, respectively.

关键词： Apatite fission track Thermal history Exhumation Mesozoic-Cenozoic Bogda Mountain

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：