Identification and geological significance of the Early Paleozoic Tianjunnanshan remnant ocean basin in the Zongwulong belt, NE Tibetan Plateau
文献类型：期刊论文
| 作者 | Fu ChangLei2,3; Yan Zhen2; Xiao WenJiao1,5; Wang BingZhang3; Niu ManLan4; Li XiuCai4; Yu LiangJun5 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2021-08-01 |
| 卷号 | 37期号:8页码:2401-2418 |
| 关键词 | Early Paleozoic Back-arc basin Remnant ocean basin Zongwulong belt Composite orogenic belt Chinese Central Orogenic Belt |
| ISSN号 | 1000-0569 |
| DOI | 10.18654/1000-0569/2021.08.09 |
| 英文摘要 | The Zongwulong belt is sandwiched in the Proto-Tethyan tectonic domain of Chinese Central Orogenic Belt and contains Tianjunnanshan ophiolite which formed during the evolution of the Paleo-Tethyan Ocean. The Tianjunnanshan ophiolite is the key geological unit to study the transition process from Proto-Tethyan to Paleo-Tethyan. It is composed of ultramafic rocks, doleite, basalt, and chert. Spinets from the serpentinite have high Mg-# values (58. 6 similar to 64. 5) and low Cr-# values ( 38. 9 similar to 43. 9 ). The basalt and dolerite belong to tholeiitic series and are characterized by left-inclined LREE, flat HREE, enrichment in Th, and depletion in Ti. Their chondrite-normalized REE and N-MORB-normalized trace element patterns are consistent with those of back-arc basin lavas. In addition, the mafic rocks have relatively high Th/Yb and low epsilon(Nd) (t) values ( + 7. 5 similar to + 9. 6) , suggesting a depleted mantle source contaminated by subducted sediment. New LA-ICP-MS zircon U-Pb dating of dolerite yields a weighted mean Pb-206/U-238 age of 509 +/- 4Ma. Combined with field occurrences, it is concluded that some ophiolitic rocks in the Zongwulong belt formed during the Cambrian Period and prior to the unconformably overlying Carboniferous flysch and the granite vein (444. 9 +/- 4. 7Ma) . These Cambrian ophiolitic rocks occur as a remnant ocean basin overlain unconfromably by the Carboniferous flysch. They are structurally injected into the overlying strata during closure of the ocean basin in Trassic. These results indicate that the Zongwulong belt is not a Late Paleozoic to Early Messozoic orogenic belt but an Early Paleozoic to Early Messozoic composite orogenic belt formed after the closure of the ProtoTethyan Ocean and Paleo-Tethyan Ocean. |
| WOS关键词 | FORE-ARC CRUST ; SUBDUCTION INITIATION ; OROGENIC BELT ; U-PB ; CLASSIFICATION ; OPHIOLITE ; EMPLACEMENT ; ELEMENTS ; GENESIS ; MARGIN |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000735639300009 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/103970]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 地质与地球物理研究所_科技支撑系统 |
| 通讯作者 | Fu ChangLei |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China 2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 3.Qinghai Geol Survey Inst, Key Lab Northern Qinghai Tibet Plateau Geol Proc, Xining 810012, Peoples R China 4.Hefei Univ Technol, Dept Resources & Environm, Hefei 230009, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fu ChangLei,Yan Zhen,Xiao WenJiao,et al. Identification and geological significance of the Early Paleozoic Tianjunnanshan remnant ocean basin in the Zongwulong belt, NE Tibetan Plateau[J]. ACTA PETROLOGICA SINICA,2021,37(8):2401-2418. |
| APA | Fu ChangLei.,Yan Zhen.,Xiao WenJiao.,Wang BingZhang.,Niu ManLan.,...&Yu LiangJun.(2021).Identification and geological significance of the Early Paleozoic Tianjunnanshan remnant ocean basin in the Zongwulong belt, NE Tibetan Plateau.ACTA PETROLOGICA SINICA,37(8),2401-2418. |
| MLA | Fu ChangLei,et al."Identification and geological significance of the Early Paleozoic Tianjunnanshan remnant ocean basin in the Zongwulong belt, NE Tibetan Plateau".ACTA PETROLOGICA SINICA 37.8(2021):2401-2418. |
入库方式： OAI收割
来源：地质与地球物理研究所
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