New chronological constrains on the tectonic affinity of the Alxa Block, NW China
文献类型：期刊论文
| 作者 | Song, Dongfang1,2; Xiao, Wenjiao1,3,4; Collins, Alan S.2; Glorie, Stijn2; Han, Chunming1,3,4; Li, Yongchen1 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2017-09-01 |
| 卷号 | 299页码:230-243 |
| 关键词 | Alxa Block Precambrian U-Pb Tectonic affinity Ribbon continent |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2017.07.015 |
| 文献子类 | Article |
| 英文摘要 | The origin and tectonic affinity of the Alxa Block in NW China is currently debatable. This study reports new stratigraphically-constrained LA-ICP-MS zircon U-Pb data from Precambrian rocks exposed in the westernmost part of the Alxa Block, to constrain their ages and provenance. Ages obtained for a granitic gneiss from the Longshoushan Group are mainly discordant yielding an upper intercept near 1200 Ma and a lower intercept between similar to 350 and similar to 310 Ma, indicating the protolith for the granitic gneiss intruded during the Mesoproterozoic, and the gneissic fabric formed in late Paleozoic associated with the accretion of the Central Asian Orogenic Belt. Detrital zircons of a meta-sandstone from Pre-Sinian strata yielded predominant Mesoproterozoic ages with bimodal peaks at similar to 1166 Ma and similar to 1375 Ma. These ages are interpreted as tectonic events associated with the long-lived accretion and collision processes coeval with the amalgamation of the Rodinia supercontinent. The youngest concordant zircon age of 968 +/- 70 Ma constrains its maximum depositional age to the Stenian-Tonian boundary. Two metasedimentary rocks from the Sinian strata share similar age patterns, yielding an earliest Paleoproterozoic peak at similar to 2469-2460 Ma, and two Tonian peaks at similar to 992-978 Ma and similar to 826-807 Ma. The youngest detrital zircon ages constrain their maximum depositional age to be latest Neoproterozoic. The detrital age patterns, as well as zircon morphology, indicate that the protoliths for these metasedimentary rocks were probably deposited in collision-related foreland basins. Our new data combined with published data indicate that the Alxa Block is not a uniform early Precambrian craton like the North China Craton, but a Precambrian composite ribbon continent which originally detached from a main cratonic accretionary and collisional margin. The Alxa Block, like the South China Craton, underwent a multi-stage tectono-thermal evolution related to the assembly of Rodinia and Gondwana supercontinents during global plate margin reorganization. Current data support a close affinity of the Alxa Block to the SCC during the Precambrian. During the Paleozoic, the Alxa ribbon continent behaved as a backbone to the Paleo-Asian Ocean to the north, on which early Paleozoic-Permian magmatic arcs were built forming the southernmost segment of the Central Asian Orogenic Belt. |
| WOS关键词 | U-PB GEOCHRONOLOGY ; DETRITAL AGE DISTRIBUTIONS ; WESTERNMOST NORTH CHINA ; CRATON KEY ISSUES ; SOUTH CHINA ; HF ISOTOPES ; PALEOPROTEROZOIC EVOLUTION ; ZIRCON GEOCHRONOLOGY ; METASEDIMENTARY ROCKS ; METAMORPHIC BASEMENT |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000411419700013 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Key Research and Development Program of China(2017YFC0601206) ; National Key Research and Development Program of China(2017YFC0601206) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; China Postdoctoral Science Foundation project(2015T80133) ; China Postdoctoral Science Foundation project(2015T80133) ; China Scholarship Council (CSC)(201504910051) ; China Scholarship Council (CSC)(201504910051) ; 41402196 ; 41402196 ; 41230207) ; 41230207) ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Key Research and Development Program of China(2017YFC0601206) ; National Key Research and Development Program of China(2017YFC0601206) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; China Postdoctoral Science Foundation project(2015T80133) ; China Postdoctoral Science Foundation project(2015T80133) ; China Scholarship Council (CSC)(201504910051) ; China Scholarship Council (CSC)(201504910051) ; 41402196 ; 41402196 ; 41230207) ; 41230207) ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Key Research and Development Program of China(2017YFC0601206) ; National Key Research and Development Program of China(2017YFC0601206) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; China Postdoctoral Science Foundation project(2015T80133) ; China Postdoctoral Science Foundation project(2015T80133) ; China Scholarship Council (CSC)(201504910051) ; China Scholarship Council (CSC)(201504910051) ; 41402196 ; 41402196 ; 41230207) ; 41230207) ; National Natural Science Foundation of China(41672219 ; National Natural Science Foundation of China(41672219 ; National Key Research and Development Program of China(2017YFC0601206) ; National Key Research and Development Program of China(2017YFC0601206) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB18020203) ; China Postdoctoral Science Foundation project(2015T80133) ; China Postdoctoral Science Foundation project(2015T80133) ; China Scholarship Council (CSC)(201504910051) ; China Scholarship Council (CSC)(201504910051) ; 41402196 ; 41402196 ; 41230207) ; 41230207) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61941]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Song, Dongfang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Adelaide, Dept Earth Sci, Ctr Tecton Resources & Explorat TRaX, Adelaide, SA 5005, Australia 3.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, Dongfang,Xiao, Wenjiao,Collins, Alan S.,et al. New chronological constrains on the tectonic affinity of the Alxa Block, NW China[J]. PRECAMBRIAN RESEARCH,2017,299:230-243. |
| APA | Song, Dongfang,Xiao, Wenjiao,Collins, Alan S.,Glorie, Stijn,Han, Chunming,&Li, Yongchen.(2017).New chronological constrains on the tectonic affinity of the Alxa Block, NW China.PRECAMBRIAN RESEARCH,299,230-243. |
| MLA | Song, Dongfang,et al."New chronological constrains on the tectonic affinity of the Alxa Block, NW China".PRECAMBRIAN RESEARCH 299(2017):230-243. |
入库方式： OAI收割
来源：地质与地球物理研究所
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