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Meso-Cenozoic tectonic events Recorded by Apatite Fission Track in the Northern Longmen-Micang Mountains Region

Acta Geologica Sinica(English Edition) 2012年第1期86卷 153-165页

作者： LEI Yongliang JIA Chengzao LI Benliang WEI Guoqi CHEN Zhuxin SHI Xin State Key Laboratory of Enhanced Oil Recovery Beijing 100083China Research Institute of Petroleum Exploration and Development(RIPED) PetroChinaBeijing 100083China PetroChina Company Limited Beijing 100010China Research Institute of Petroleum Exploration and Development-Langfang Langfang 065007China

There is a cross-cutting relationship between the E-W trending structures and the NE- trending structures in the northern Longmen-Micang Mountains region, which reflects possible regional tectonic transition and migration. Apatite fission track （AFT） analyses of 15 samples collected from this area yield apparent ages varying from 30.3±4.2 Ma to 111.7±9.0 Ma and confined-track-lengths ranging from 10.6±0.3 pm to 12.4±0.1 μm. Four specific groups were identified on the basis of the Track Age Spectrum Calculation （TASC） patterns, i.e., 143-112 Ma, 93.6-88 Ma, 42-40 Ma and -25.6 Ma. These age groups correspond to the spatial distributions of datasets and may represent four tectonic events. Together with the regional deformation patterns, the four age groups are interpreted to indicate tectonic superposition, transition and migration during the Meso-Cenozoic with the following possible order：（1） the Micang Mountains belt was dominated by the E-W trending structure during 143-112 Ma; （2） the contraction of the Longmen Mountains belt from the NW to the SE during 93.6-88 Ma led to the superposition of the NE-trending structures over the E-W trendinding structures; （3） dextral strike-slip shear dominated the Longmen Mountains belt at 42-40 Ma; （4） westward migration of the active tectonic belt occurred from 93.6-25.6 Ma in a break-back sequence in the northern Longmen Mountains belt. The Late Cenozoic tectonics in the northern Longmen Mountains belt are characterized by the dextral strike-slip shear and the occurrence of westward break-back sequence of deformations. As a result, north-south differences in deformations along the Longmen Mountains belt were intensified since the Miocene time and strains were mainly accumulated in the hinterland of the Longmen Mountains instead of being propagated to the foreland basin.

关键词： apatite fission track tectonic events Longmen Mountains Micang Mountains Meso-Cenozoic

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Revised Chronostratigraphic Framework of the Metamorphic Strata in the Jiangnan Orogenic Belt,South China and its tectonic Implications

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Acta Geologica Sinica(English Edition) 2012年第2期86卷 339-349页

作者： GAO Linzhi DING Xiaozhong ZHANG Chuanheng CHENJun LIU Yaorong ZHANG Hang LIU Xanxue PANG Weihua Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Hunan Institute of Geological Survey Changsha410002HunanChina China University of Sciences Beijing 100083China Chengdu Institute of Mineral and Resource Chengdu 610081SichanChina

In a re-study of regional geology by the China Geological Survey （CGS）, the key problem is in the stratigraphical division and correlation. According to the new isotopic dating of the Mesoand Neoproterozoic in China, there have been great changes in the strata correlation and tectonic explanation. The authors obtained four zircon sensitive high resolution ion micro-probe （SHRIMP） U- Pb datings from the bentonite of the Lengjiaxi Group （822±10 Ma, 823±12 Ma and 834±11 Ma） and Banxi Group （802.6±7.6 Ma） in north Hunan Province, which is considered to be the middle part of the Jiangnan Orogenic Belt. On the basis of the zircon dating mentioned above, the end of the Wuling orogen is first limited in the period from 822 Ma to 802 Ma in one continued outcrop （Lucheng section） in Linxiang city, Hunan Province. Combining a series of new zircon U-Pb datings in the Yangtze and Cathaysia blocks, several Neoproterozoic volcanic events and distribution of the metamorphic rocks in the Jiangnan Orogenic Belt have been distinguished. In the context of the global geodynamics, it is useful to set up a practical and high precision chronological framework and basic and unified late Precambrian section in South China.

关键词： chronostratigraphic tectonic events orogenic belt Meso-and Neoproterozoic South China continent

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Construction of the Continental Asia in Phanerozoic:A Review

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 26-51页

作者： CHEN Xuanhua DONG Shuwen SHI Wei DING Weicui ZHANG Yiping LI Bing SHAO Zhaogang WANG Ye MNR Laboratory of Deep Earth Science and Technology and the SinoProbe CenterChinese Academy of Geological Sciences and China Geological SurveyBeijing 100037China State Key Laboratory for Mineral Deposits Research Nanjing UniversityNanjing 210023China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China

This is a review of the formation and tectonic evolution of the continental Asia in *** continental Asia has formed on the bases of some pre-Cambrian cratons,such as the Siberia,India,Arabia,North China,Tarim,South China,and Indochina,through multi-stage plate convergence and collisional collages in *** north-central Asia had experienced the expansion and subduction of the Paleo-Asian Ocean(PAO)in the early Paleozoic and the closure of the PAO in the late Paleozoic and early Mesozoic,forming the PAO regime and Central Asian orogenic belt(CAOB).In the core of the CAOB,the Mongol-Okhotsk Ocean(MOO)opened with limited expansion in the Early Permian and finally closed in the Late Jurassic–Early *** south-central Asia had experienced mainly multi-stage oceanic opening,subduction and collision evolution in the Tethys Ocean,forming the Tethys regime and Himalaya-Tibetan orogenic *** eastern Asia,the plate subduction and continental margin orogeny on western margin of the Pacific Ocean,forms the West Pacific regime and West Pacific orogenic *** PAO,Tethys,and West Pacific regimes,together with Precambrian cratons among or surrounding them,made up the major tectonic and dynamic systems of the continental Asia in *** tectonic events,such as the Early Paleozoic Qilian,Uralian,and Dunhuang orogeneses,the late Paleozoic East Junggar,Tianshan and West Junggar orogeneses,the Middle to Late Permian Ailaoshan orogeny and NorthSouth Lhasa collision,the early Mesozoic Indochina-South China and North-South China collisions,the late Mesozoic Mongolia-Okhotsk orogeny,Lhasa-Qiangtang collision,and intra-continental Yanshanian orogeny,and the Cenozoic IndoAsian,Arab-Asian,and West Pacific margin collisions,constrained the formation and evolution of the continental *** complex dynamic systems have left large number of deformation features,such as large-scale strike-slip faults,thrustfold systems and extensional detachments on th

关键词： Paleo-Asian Ocean Tethys West Pacific tectonic events geodynamic systems continental Asia Phanerozoic

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Detrital Zircon Dating of Meso-and Neoproterozoic Rocks in North China and Its Implications

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Acta Geologica Sinica(English Edition) 2011年第2期85卷 271-282页

作者： GAO Linzhi LIU Pengju YIN Chongyu ZHANG Chuanheng DING Xiaozhong LIU Yanxue SONG Biao Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China China University of Geosciences Beijing 100083 China Beijing SHRIMP Center Beijing 100037 China

New dates from Meso- and Neoproterozoic strata contribute to the recently defined Precambrian stratigraphical timescale of China agreed by the Subcommission on the Precambrian System, and the National Commission on Stratigraphy of China on Nov. 24, 2009. First, the age range of the Changcheng System, including the Changzhougou, Chuanlinggou, Tuanshanzi and Dahongyu formations has been constrained to 1.8-1.6 Ga. Second, the Jixian System including the Gaoyuzhuang,Yangzhuang, Wumishan, Hongshuizhuang and Tieling formations has been constrained to 1.6-1.4 ***, an as-yet unnamed （undefined） system （1.4-1.0 Ga） is only developed in the Xiamaling Formation at the Jixian section, Tianjing. Fourth, the Qingbaikou System, including the Luotuoling and Jing＇eryu formations has been constrained to 1.0-0.78 Ga. Fifth, the Nanhuan System ranges between 780-635 Ma, and the Sinian System is within 635-542 Ma. However, according to a series of SHRIMP U-Pb dates from the late Precambrian in the Jiangnan Orogen Belt in South China Platform, the constrained strata will be redefined as in the upper part of the Qingbaikou System. To aid global geodynamies, it is useful to denote a late Precambrian section with unified, precise and high-precision chronological dating; this is here defined in North China Block and Jiaoliao-Korean Block. However, the Neoproterozoic Qingbaikou study in North China will be influence in whole Meso- and Neoproterozoic in the Jiangnan Orogenic Belt in between the Yangtze Block and the Cathaysia Block in South China.

关键词： Meso- and Neoproterozoic chronostratigraphic sequence tectonic events China

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The Influence of an Interdependent Structures on the Post-Mesozoic Evolution of the Eastern Flank of the Mongol-Okhotsk Orogenic Belt

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International Journal of Geosciences 2022年第6期13卷 464-482页

作者： Inna Derbeko Institute of Geology and Nature Management Far Eastern Branch Russian Academy of Sciences Blagoveschensk Russia

Based on the analysis of known geodynamic models that explain the processes in various geodynamic settings of the Meso-Cenozoic stages of the development of continental margins and the tectonic-magmatic events accompanying these processes, as well as on the basis of our own data obtained as a result of many years of research on the axial structure of the Central Asian Fold Belt-Mongol-Okhotsk orogenic belt and the influence of interdependent structures on the post-Mesozoic evolution of the eastern flank of the Mongol-Okhotsk orogenic belt was substantiated by us. The closure of the Mongol-Okhotsk basin due to the approach of the Siberian and North China cratons was accompanied by a change in geodynamic conditions: subduction, collision, intraplate-rift and was reflected in the formation of synchronous igneous complexes in the frame of the Mongol-Okhotsk orogenic belt. In the northern frame of the belt, the distribution of magmatites is cut off by the structure of the Selenga-Stanovoy superterrane in the west. The northern boundary of the superterrane is the zone of the Dzheltulak fault. In the south, it borders on the Mongol-Okhotsk orogenic belt along the zone of tectonic melange. We believe that evolutionary processes within the orogenic belt and its framing continued into the post-Mesozoic time after the final formation of the belt as an orogen. The position of the Selenga-Stanovoy superterrane in the late Mesozoic did not correspond to the modern one. The structures of the Central Asian fold belt located between the Mongol-Okhotsk orogenic belt and the Siberian craton in the Cenozoic were influenced by collisional processes occurring between the Indian and Eurasian plates. And these processes were not only the “driving force” for the movement of the Selenga-Stanovoy superterrane in the post-Mesozoic time, but also changed the structure of the Mongol-Okhotsk orogen, dividing it into two flanks.

关键词： Mongol-Okhotsk Orogenic Belt Magmatism Late Mesozoic Subduction Collision tectonic events

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