Provenance of Lower Cretaceous Clastic Rocks in Suibin Depression Heilongjiang Province and Its Tectonic Significance
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摘要: 黑龙江省东部绥滨坳陷下白垩统从下而上为滴道组、城子河组、穆棱组和东山组。通过分析各组砂岩—泥岩主量元素、微量元素和稀土元素的特征，揭示了不同时期盆地的源区构造背景存在差异。滴道组源区构造背景为活动大陆边缘，城子河组、穆棱组多呈现出从活动大陆边缘向火山弧转换的地球化学特征，东山组则反映活动大陆边缘构造背景。结合各组古水流方向、沉积相特征和岩屑所反映的源区岩性特征，认为滴道组物源主要来自于盆地南侧，城子河组、穆棱组时期则主要来自盆地东南，并且碎屑岩均来自上地壳。 Abstract: Lower Cretaceous of Suibin depression includes Didao , Chengzihe, Muleng and Dongshan Formations.The geochemical compositions of sandstones and mudstones in Suibin depression, Sanjiang basin reveal the tectonic settings in the different epochs. Didao Formation mainly represents active continental margin but the rocks of Chengzihe and Muleng indicate the transition from continental island to active continental margin. Dongshan Formation expresses active continental margin. Combined with ancient direction of waterflow, the characteristic of the facies of sedimentary rocks and lithic fragments, it is referred that the provenance of Didao Formation located in the south of the Suibin depression and the provenance of Chengzihe , Muling and Dongshan Formations in the southeast of the Suibin depression. The primary materials of sedimentary rocks should come from the upper crust. This provides strong geochemical evidence for realizing the evolution of basins of eastern Heilongjian province correctly.
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Key words:
- geochemistry /
- tectonic setting /
- provenance analysis /
- Suibin depression /
- Heilongjiang province
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