The Discovery of Late Triassic-Early Jurassic Volcanic Rocks and Their  Geological Implications in Northern Songnen Block, Heilongjiang Province

Abstract

Abstract:

Basaltic andesites are widely distributed in the northern Songnen Block, Heilongjiang Province and their ages are critical to understand the regional tectonic evolution in this area. This study presents LA-ICP-MS zircon U-Pb age data and geochemical data for the basaltic andesite from the Banzifang Formation previously considered to be Early Cretaceous. Two samples yield U-Pb ages of (200.0±1.4)Ma and (200.0±1.3) Ma respectively，demonstrating that they were formed in Late TriassicEarly Jurassic rather than Early Cretaceous. The basaltic andesites are metaluminous, mainly high-K calc-alkaline. They are characterized by enrichment of large ion lithophile elements (LILE) such as Ba, Rb, K, Pb and LREE, depletion of high field strength elements (HFSE) such as Nb, Ce, Nd, Ti and HREE, indicating that the basaltic andesites belong to continental arc volcanic rocks. The results demonstrate that there has been Late Triassic-Early Jurassic volcanic belts in Xiaoxinganling-Zhangguangcailing, these occurrence, together with synchronous granites, comprise a Mesozoic N-S-striking magmatic belt.

Key words: Songnen block, basalt andesite, zircon U-Pb age, continental arc volcanic rock

CLC Number:

P588.1

Lv Chang-lu1,2，XIAO Qing-hui3，FENG Jun-ling4， LI Xin-peng2， DENG Chang-zhou2， R. The Discovery of Late Triassic-Early Jurassic Volcanic Rocks and Their Geological Implications in Northern Songnen Block, Heilongjiang Province[J]. Geoscience, 2015, 29(4): 855-865.

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The Discovery of Late Triassic-Early Jurassic Volcanic Rocks and Their Geological Implications in Northern Songnen Block, Heilongjiang Province

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