大兴安岭北段塔河地区晚寒武世中基性火山岩的发现及其地质意义

doi:10.13278/j.cnki.jjuese.201701112

Abstract

Abstract: There exist a set of intermediate-basic volcanic rocks in Tahe, north east part of Erguna massif,which consist of basaltic-andestite, basaltic-trachyandesite and trachybasalt. This set of volcanic rocks was previously allocated to the Middle-Late Jurassic Tamulangou Formation. However, according to the ²⁰⁶Pb/²³⁸U isotope of zircon determination data of (501.1±1.4) Ma (n=23) and (500.50±0.95) Ma(n=14)for basaltic-andestite and trachybasalt, it is the first reported existence of Cambrian volcanic rocks north of Tahe. Intermediate-basic volcanic shows the sub alkalne shoshonite series feature, and without any metamorphose; negative Eu anomalies, (La/Yb)_N=16.63-25.91; Rich Ba, Rb, Sr, and K and depletion Nb,Ta,Ti. The magma is likely related to the extension in the island-arc background, and it is considered that there exists the Cambrian in the certain range of this area. The research results provide new materials for re-evaluating the Mesozoic volcanic rocks in local area of northern Da Hing gan, discussing the evolution history of Xinlin-Xiguitu fault, and the continental crust evolution of Erguna massif at the southwest edge of the Siberia plate.

Key words: Da Hinggan Mountain, Tahe area, Late Cambrian, basalt-andesite, zircons U-Pb geochronology

CLC Number:

P588.14

Wang Yan, Yang Xiaoping, Na Fuchao, Fu Junyu, Sun Wei, Yang Fan, Liu Yingcai, Zhang Guangyu, Song Weimin, Yang Yajun, Qian Cheng, Pang Xuejiao. Discovery of the Late Cambrian Intermediate-Basic Volcanic Rocks in Tahe, Northern Da Hinggan Mountain and Its Geological Significance[J].Journal of Jilin University(Earth Science Edition), 2017, 47(1): 126-138.

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Discovery of the Late Cambrian Intermediate-Basic Volcanic Rocks in Tahe, Northern Da Hinggan Mountain and Its Geological Significance

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