The Alabiyebastaw and Kamuste Formations, in ages of Early Devonian and Early Carboniferous respectively, represent sedimentary responses of different stages of the crustal accretion in the Kamuste area, Eastern Junggar, Xinjiang. The sandstones of Alabiyebastaw Formation are composed of volcanic and sedimentary detritus, and subordinately, of plagioclase and quartz mineral fragments, reflecting a predominant undissected magmatic arc provenance. The geochemistry of sandstone mudstone suites further indicates a felsic intermediate igneous provenance, which constrained the Alabiyebastaw Formation having derived from a tectonic setting of differentiated oceanic continental margin island arc. Likewise, the geochemistry and sandstone petrography of the Kamuste Formation reflects mixed provenance signatures of dominant magmatic arcs and minor basement uplifts and subduction complexes, indicating a tectonic setting of differentiated continental island arc. The facies analysis indicates that the Alabiyebastaw and Kamuste Formations are two kinds of turbiditic successions deposited on a submarine slope and a submarine fan plain respectively. The features of petrography and geochemistry, combined with structural and stratigraphic analyses allow for a thorough evaluation of the provenance and tectonic setting of Devonian and Carboniferous sedimentary rocks. The submarine slope turbiditic deposits of the Alabiyebastaw Formation record the main sedimentary response of the early Devonian back-arc basins of the Northern Junggar tectonic belt with the source of island arc detritus mainly portrayed as a northern fringing arc system; the submarine fan plain turbiditic and hemipelagic deposits of the Kamuste Formation record the main sedimentary response of the late Early Carboniferous inter-arc relict sea basins of the Eastern Junggar composite terrane with source areas on both sides supplying detritus and particulate materials.
Zhang Xiaohui,Li Tiesheng,Hu Nenggao et al. LATE PALEOZOIC SEDIMENTARY RECORDS IN KAMUSTE AREA, EASTERN JUNGGAR, XINJIANG: PROVENANCE AND FACIES ANALYSES[J]. Chinese Journal of Geology, 2002, (1): 13-26.