Provenance and tectonic setting of the Ordovician sedimentary succession at the southeastern margin of the Yangtze Block, South China: Implications for paleotopographic evolution of northestern Gondwana

被引:9
作者
He, Yaoyan [1 ,2 ,3 ,4 ]
Niu, Zhijun [2 ,3 ,4 ]
Yao, Huazhou [3 ,4 ]
Song, Fang [1 ,2 ,3 ,4 ]
Yang, Wenqiang [2 ,3 ,4 ]
机构
[1] China Univ Geosci, Inst Geol Survey, Wuhan 430074, Peoples R China
[2] China Geol Survey, Key Lab Paleontol & Coevolut Life & Environm, Wuhan 430205, Peoples R China
[3] China Geol Survey, Wuhan Ctr Geol Survey, Wuhan 430205, Peoples R China
[4] Wuhan Ctr China Geol Survey, Hubei Key Lab Paleontol & Geol Environm Evolut, Wuhan 430205, Peoples R China
基金
中国国家自然科学基金;
关键词
Ordovician; South China; Provenance; Paleotopography; Gondwana; Early Paleozoic; U-PB GEOCHRONOLOGY; EARLY PALEOZOIC TECTONISM; DETRITAL ZIRCON GEOCHRONOLOGY; RARE-EARTH-ELEMENTS; JIANGNAN OROGEN; CATHAYSIA BLOCK; HF ISOTOPES; TRACE-ELEMENTS; DEPOSITIONAL-ENVIRONMENTS; GEOCHEMICAL EVIDENCE;
D O I
10.1016/j.jseaes.2020.104532
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Ordovician sedimentary strata at the southeastern margin of the Yangtze Block consist of, from bottom to top, fine-grained siliciclastic rocks, cherts with interlayers of siliceous/carbonaceous slate, and coarse-grained siliciclastic rocks, which are important for understanding the tectono-sedimentary evolution in South China. A combined analysis of petrography, whole-rock geochemistry, and zircon U-Pb dating was carried out on these strata. The cherts with radiolarian fossils have high Al/(Al + Fe + Mn) values (0.38-0.94) and no obvious Ce anomalies (1.09 +/- 0.05), suggesting a biogenic origin on a continental margin. The geochemical features of the siliciclastic rocks, including ratios of elements, discriminant functions, and ternary diagram positions, suggest a passive margin setting that received detritus mostly derived from intermediate to felsic igneous rocks and recycled quartzose sedimentary rocks. The source areas of the Ordovician siliciclastic rocks existed in semiarid-arid paleoclimate and moderate weathering conditions. The sandstone modal grain compositions and detrital zircon cumulative curves indicate a collisional setting of the source areas. Zircon age populations have been time-varying during the Early Paleozoic. Based on the above-mentioned evidences, the following basin filling and paleotopographic evolution process has been proposed in research area. In the Cambrian, a bilateral filling pattern reflected a flat and broad basin. In the Early Ordovician, longer transportation of SE-sourced sediments reflected the uplift of Gondwana. In the Late Ordovician, uplift of the Wuyi-Yunkai Orogen blocked some Gondwanan detritus (500-700 Ma) and released recycled (900-1100 Ma) and syn-orogenic detritus. Meanwhile, synchronous uplift of the Jiangnan Orogen led to a steeper and narrower basin, and sediments could reach farther distances in a shorter time. In the Silurian, a unidirectional filling pattern with overwhelming SE-sourced detritus indicated intense uplift of Gondwana and the Wuyi-Yunkai Orogen.
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页数:20
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