Provenances of the Middle-Late Triassic in the Helan Mountain and its temporal-spatial evolution
Li Meng1, 2, Zhao Hong-Ge1, 2, Li Wen-Hou1, Ren Zhan-Li1, Zhuo Yu-Zhou1, Fu Xing-Hui1
1 Depertment of Geology,Northwest University,Xi'an 710069,Shaanxi; 2 State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,Shaanxi;
Abstract：Combined with conglomerate composition,strata thickness and sedimentary facies,heavy mineral compositions were firstly used to study the provenances of the Middle-Late Triassic in the Helan Mountain. Results showed that the provenance of the Middle-Late Triassic sediments in the Helan Mountain were characterized by multiple and mixed sources,and were varied greatly. Sediments of the Middle Triassic Zhifang Formation were mainly from northwest and west. However,sediments of the Late Triassic Yanchang Formation changed. During deposition of the lower two members T3y1 and T3y2,sediments were mainly derived from the northwest,west and south. During deposition of the upper three members T3y3 to T3y5,eastern sources appeared,which were distributed in the Ruqigou to Xiangbangzigou. The western provenance was mainly in the sedimentary strata on the Alxa Block. Sediments of northwestern part were mainly from the Precambrian metamorphic rocks and Paleozoic magmatic rocks in the Paleoproterozoic Khondalite Belt,which was different from the southwestern part. Sediments in its eastern part were sourced from the sedimentary strata of Yinchuan graben and areas to its east. Provenance transformation of the Middle-Late Triassic strata in the Helan basin occurred twice: One from the Zhifang to Yanchang formations T3y1,and the other from the T3y2 to T3y3.These two prominent transitions suggested significant transformation of the dynamic mechanism in the Helan basin.
Li Meng,Zhao Hong-Ge,Li Wen-Hou et al. Provenances of the Middle-Late Triassic in the Helan Mountain and its temporal-spatial evolution[J]. JOPC, 2018, 20(6): 1068-1085.
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