Depositional Environment of the Tertiary Fenghuoshan Group in the Hoh Xil Basin, Northern Tibetan Plateau

LIU Zhi fei; WANG Cheng shan

Fcnghuoshan Group, with total thickness up to 4 782.8 m and geologic age from Earlv Eoccnc to Earlv oligocene, is widclv distributed in the Hoh Xil hasin, which is the largest Tcrtiarv scdimcntarv basin in the hinterland of the Tibetan plateau.The pile of sediments consists of gray-violet sandstone mudstonc and conglomerate.The evolution of dcpositional environment has undergone four periods: mainly fluvial environment during 56.0-52.2 Ma, lacustrinc environment during 52.2-43.1 Ma, fluvial and fan-delta environments during 43.1-38.3 Ma}~and mainly fluvial environment during 38.3 -32.0 Ma.Palcocurrcnt directions were changed to castsouthward from castnorthward in the early period then to north-ward in the late period.Thcsc changes indicate the dcpoccntcr of the Hoh Xil basin migrated eastward and northward. The evolution of the dcpositional environment and migration of the dcpoccntcr could he affected by early uplift of the Tibetan plateau

1 Laboratory of Marine Geology, Tongji University,Shanghai 200092;

2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059

Received Date: 2000-01-21

Rev Recd Date: 2000-03-27

Publish Date: 2001-03-10

Key words:

Abstract: Fcnghuoshan Group, with total thickness up to 4 782.8 m and geologic age from Earlv Eoccnc to Earlv oligocene, is widclv distributed in the Hoh Xil hasin, which is the largest Tcrtiarv scdimcntarv basin in the hinterland of the Tibetan plateau.The pile of sediments consists of gray-violet sandstone mudstonc and conglomerate.The evolution of dcpositional environment has undergone four periods: mainly fluvial environment during 56.0-52.2 Ma, lacustrinc environment during 52.2-43.1 Ma, fluvial and fan-delta environments during 43.1-38.3 Ma}~and mainly fluvial environment during 38.3 -32.0 Ma.Palcocurrcnt directions were changed to castsouthward from castnorthward in the early period then to north-ward in the late period.Thcsc changes indicate the dcpoccntcr of the Hoh Xil basin migrated eastward and northward. The evolution of the dcpositional environment and migration of the dcpoccntcr could he affected by early uplift of the Tibetan plateau

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Depositional Environment of the Tertiary Fenghuoshan Group in the Hoh Xil Basin, Northern Tibetan Plateau

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