Tectonic Evolution of the West Bogeda: Evidences from Zircon U-Pb Geochronology and Geochemistry Proxies, NW China

Yalong Li,Jiaze Song,Xinghe Yu,Xiangtong Huang,Xin Shan,Shouye Yang,Xun Yu,Wei Yue,Zongquan Yao

doi:10.3390/min10040341

Abstract

The Bogeda Shan (Mountain) is in southern part of the Central Asian Orogenic Belt (CAOB) and well preserved Paleozoic stratigraphy, making it an ideal region to study the tectonic evolution of the CAOB. However, there is a long-standing debate on the tectonic setting and onset uplift of the Bogeda Shan. In this study, we report detrital zircon U-Pb geochronology and whole-rock geochemistry of the Permian sandstone samples, to decipher the provenance and tectonic evolution of the West Bogeda Shan. The Lower-Middle Permian sandstone is characterized by a dominant zircon peak age at 300–400 Ma, similar to the Carboniferous samples, suggesting their provenance inheritance and from North Tian Shan (NTS) and Yili-Central Tian Shan (YCTS). While the zircon record of the Upper Permian sandstone is characterized by two major age peaks at ca. 335 Ma and ca. 455 Ma, indicating the change of provenance after the Middle Permian and indicating the uplift of Bogeda Shan. The initial uplift of Bogeda Shan was also demonstrated by structural deformations and unconformity occurring at the end of Middle Permian. The bulk elemental geochemistry of sedimentary rocks in the West Bogeda Shan suggests the Lower-Middle Permian is mostly greywacke with mafic source dominance, and tectonic setting changed from the continental rift in the Early Permian to post rift in the Middle Permian. The Upper Permian mainly consists of litharenite and sublitharenite with mafic-intermediate provenances formed in continental island arcs. The combined evidences suggest the initial uplift of the Bogeda Shan occurred in the Late Permian, and three stages of mountain building include the continental rift, post-rift extensional depression, and continental arc from the Early, Middle, to Late Permian, respectively.

Highlights

The Central Asian Orogenic Belt (CAOB) is located between the Siberia Craton to the north and the Tarim and North China Craton to the south
This study aims to illustrate the provenances, tectonic setting, and evolution of the West Bogeda Shan during the Permian based on the integrated analyses of petrology, detrital zircon U-Pb geochronology, and bulk geochemistry of sedimentary rocks from the
This study presents the data of detailed zircon U-Pb geochronology and whole-rock geochemical compositions of Permian sandstones from the West Bogeda Shan, and discusses the provenances, source rock compositions, tectonic settings and basin evolution history

Summary

Introduction

The Central Asian Orogenic Belt (CAOB) is located between the Siberia Craton to the north and the Tarim and North China Craton to the south. It is regarded as the largest (extending 7000 km from west to east) accretionary orogenic belt on Earth. It was formed by a series of amalgamation events of several micro-continents and island arcs during the Late Carboniferous to Permian periods (Figure 1a) [1,2,3]. It is the key orogenic belt to study the tectonic evolution of the CAOB due to its CAOB due to itsstratigraphic well-preserved stratigraphic units of ophiolites, rocks, granitoids, high-grade well-preserved units of ophiolites, volcanic rocks, volcanic granitoids, high-grade metamorphic metamorphic rocks, and sedimentary sequences [4,5,6,7]

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