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Analysis of Sediment Provenance of Upper Devonian Tiekuangliang Formation in Xiagaochuan Basin, the Northern Margin of Yangtze Plate(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2017年第01期
Page:
47-64
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Analysis of Sediment Provenance of Upper Devonian Tiekuangliang Formation in Xiagaochuan Basin, the Northern Margin of Yangtze Plate
Author(s):
JIA Xiao-tong ZHANG Ying-li WANG Zong-qi WANG Kun-ming WANG Gang
1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. School of Graduates, China University of Geosciencs, Beijing 100083, China
Keywords:
sediment provenance Tiekuangliang Formation Late Devonian heavy mineral tourmaline electron microprobe zircon U-Pb age Xiagaochuan Basin the northern margin of Yangtze Plate
PACS:
P512.2
DOI:
-
Abstract:
Xiagaochuan Basin is a special tectonic unit between Yangtze Block and Qinling orogen. The tectonic evolution of Late Devonian is obviously different from that of the adjacent tectonic units. In order to understand the tectonic evolution of Xiagaochuan Basin, the sediment provenance of sandstone of Upper Devonian Tiekuangliang Formation was studied. Taking quartz sandstone as the research object, heavy mineral assemblages were analyzed, and then the tourmaline electron microprobe analysis and LA-MC-ICP-MS zircon U-Pb dating were determined, respectively. The heavy mineral assemblages of sphalerite, leucite and ilmenite indicate that they can be provided by magmatic rocks. The tourmaline electron microprobe analysis shows that the sandstone from Tiekuangliang Formation is mainly from metapelites and metapsammites, and a small amount of Li-poor granitoids and associated pegmatites and aplites. The zircon U-Pb age spectra of sandstone suggest that the provenance of sandstone from Tiekuangliang Formation mainly comes from the rocks with the ages of 425-530 Ma and 578-982 Ma. The 425-530 Ma rocks are Tianshui and Danfeng granites, Foping gneiss and Qingshui dacite; the 578-982 Ma rocks are Zhashui (Heigou) alkaline granite, Tianshui and Xixia gneisses, and Danfeng and Lushi granites. Furthermore, the rocks including 1 015-1 551 Ma Foping biotite plagioclase gneiss, 1 658-1 957 Ma Taibai and Baoji granites, and Foping gneiss, 2 329-2 502 Ma Danfeng garnet gneiss, and 2 625-3 147 Ma Shangnan Archean crystalline basement, have undergone several transportation and provided secondary provenance from Xiagaochuan Basin, the northern margin of Yangtze Plate. Based on the regional data, the Late Devonian provenance is roughly from the north. Meantime, the paleogeographic pattern shows that the rocks in Tianshui, Danfeng, Qingshui and Xixia areas are uplifted and eroded, becoming the provenance areas. Moreover, there are many small oldlands between North China paleoland and Xiagaochuan Basin, the northern margin of Yangtze Plate, such as Foping, which is also the provenance area.

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Last Update: 2017-01-20