Sedimentary characteristics of the Early-Middle Triassic on the south flank of the the Xilin faulted block in the Nanpanjiang basin and its tectonic implications
文献类型：期刊论文
| 作者 | Xia WenJing1,2; Yan QuanRen1; Xiang ZhongJin3; Xia Lei1; Jiang Wen1; Wei Wei4 ; Li XiaoJian1; Zhou Bin1
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| 刊名 | ACTA PETROLOGICA SINICA
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| 出版日期 | 2018 |
| 卷号 | 34期号:7页码:2119-2139 |
| ISSN号 | 1000-0569 |
| 关键词 | Xilin faulted block Nanpanjiang basin Early to Middle Triassic MTD (Mass-transport deposit) |
| 英文摘要 | The Indosinian orogeny plays an important role in the tectonic evolution of the South China block (SCB). As the biggest basin associated with the Indosinian orogeny on the southern margin of the SCB, the Nanpanjiang basin draws great attention in the geological community. Although many advances have been achieved, the time of the tectonic regime transition from extension to compression of the Nanpanjiang basin remains in dispute. In the central Nanpanjiang basin, the Paleozoic and Triassic strata are well outcropped around the Xilin faulted block, which provides an ideal studying object on revealing the basin evolution. In order to reveal the tectonic evolution of the Nanpanjiang basin, we have conducted a detailed sedimentary faces analysis, paleo-current measurement and frame-work clast statistics in the south flank of the Xilin faulted block. Our detailed field investigations show that the Lower Triassic on the south flank of the Xilin faulted block is composed of three subsequences which outcrop one by one in a southward younger order: (1) Tidal flat and lagoon deposits consist of mudstone, marlstone and calcarenite with tuff layers; (2) Mass-transport deposits (MTD) alternated with turbidite fan deposits include conglomerate, pebbly sandstone, fine sandstone and siltstone; and (3) Turbidite fans deposits include medium-coarse sandstone, siltstone and mudstone. The Middle Triassic consists of a sequence of coarse sandstone, fine sandstone, siltstone and mudstone which is interpreted to be a turbidite deposition. The facies' evolution indicates a deepening sediment environment during the Early to Middle Triassic. The paleocurrent and detrital composition analysis indicate that the detritus of the Lower Triassic in the Xilin area were mainly sourced from the Xilin fault block, while the Middle Triassic deposits in the basin were from composed provenances including the Jiangnan orogenic belt, the Kangdian massif, the Yunkai massif, the Emeishan basalt and the faulted blocks. The sediment facies' and provenance evolutions varying with time documented a sedimentary environmental evolution of the Nanpanjiang basin from the isolated carbonate platform to the half-deep sea turbidite basin. The Early Triassic MTD is the direct sedimentary records of the basin opening. The geological facts acquired in this study suggest that the Nanpanjiang basin was controlled by a regional extension regime in the Early Triassic, and the isolated carbonate platform with the Paleozoic strata is faulted blocks formed during the basin opening. In accord with this study, the mafic dikes (ca. 258 similar to 248 Ma) inside the basin intruding into underlying strata of the Lower Triassic and tuff interlayers (ca. 249.4 +/- 1.2Ma) in the Lower Triassic in the Xilin area also suggest an extension regime coeval with the basin opening during the Late Permian and the Early Triassic. The Middle Triassic turbidite fans are dominant deposits in the Nanpanjiang basin, which indicates the basin extension continued to the Middle Triassic. The opening of the Nanpanjiang basin is highly coincident with the closure of a branch of the Paleotethys Ocean in temporal and spatial, indicating that the basin was the part of subduction system of the Paleoethys oceanic lithosphere during the Late Permian to Middle Triassic. The absence of the Upper Triassic in the Napanjiang basin and adjacent areas indicates that the basin extension or subduction of the Paleotethys oceanic lithosphere terminated after the Middle Triassic. |
| WOS关键词 | LARGE IGNEOUS PROVINCE ; EMEISHAN FLOOD BASALTS ; U-PB GEOCHRONOLOGY ; TRUONG SON BELT ; INDO-CHINA ; NORTHERN VIETNAM ; SW CHINA ; ZIRCON GEOCHRONOLOGY ; INDOSINIAN OROGENY ; YUNNAN PROVINCE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000451724300018 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/89622]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Yan QuanRen |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Univ Orleans, UMR CNRS 7327, Inst Sci Terre Orleans, F-45100 Orleans, France 3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xia WenJing,Yan QuanRen,Xiang ZhongJin,et al. Sedimentary characteristics of the Early-Middle Triassic on the south flank of the the Xilin faulted block in the Nanpanjiang basin and its tectonic implications[J]. ACTA PETROLOGICA SINICA,2018,34(7):2119-2139. |
| APA | Xia WenJing.,Yan QuanRen.,Xiang ZhongJin.,Xia Lei.,Jiang Wen.,...&Zhou Bin.(2018).Sedimentary characteristics of the Early-Middle Triassic on the south flank of the the Xilin faulted block in the Nanpanjiang basin and its tectonic implications.ACTA PETROLOGICA SINICA,34(7),2119-2139. |
| MLA | Xia WenJing,et al."Sedimentary characteristics of the Early-Middle Triassic on the south flank of the the Xilin faulted block in the Nanpanjiang basin and its tectonic implications".ACTA PETROLOGICA SINICA 34.7(2018):2119-2139. |
入库方式： OAI收割
来源：地质与地球物理研究所
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