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Geoscience ›› 2018, Vol. 32 ›› Issue (04): 786-795.DOI: 10.19657/j.geoscience.1000-8527.2018.04.15

• Sedimentology • Previous Articles     Next Articles

Geochemical Characteristics and Geological Implications of Sandstones in Muling Formation of Lower Cretaceous, Laoheishan Basin, Heilongjiang Province

XU Yinbo1(), LI Feng1, ZHANG Jiaqiang1, SUN Pingchang2, BI Caiqin1, TONG Lihua1, LI Zhao1   

  1. 1. Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China
    2. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China
  • Received:2017-04-27 Revised:2018-05-12 Online:2018-08-10 Published:2018-09-19

Abstract:

The Laoheishan Basin is located in Heilongjiang Province, northeast of China, the coal and oil shale are developed in Muling Formation of Lower Cretaceous. Systematic sampling was made and sandstones of Muling Formation in the Laoheishan Basin were analyzed. The results show that the major elements of sandstones in Muling Formation has the characteristics of Fe2O3 less than the FeO, but CaO more than MgO. And the rare earth elements of sandstones show an enrichment in light rare earth elements, a flat trending in heavy rare elements and a negative europium anomaly in most samples. However, there is a significant difference in the enrichment and loss of trace elements between samples. Related discriminations indicate that the source rocks of sandstones were carried and accumulated in short distance which mainly came from felsic rocks of the upper crust without experiencing deposition and recycling. Through the judgment combined with the geochemical characteristic, Dincksion diagram of sandstones and the study of regional tectonic setting, sandstones of Muling Formation have several provenances, and source region majorly was formed in the recycled orogeny and basement uplifted provenances under the tectonic background of active continental margin at the end of Indo-China Movement. Source rocks mostly came from felsic volcanic rocks and intrusive rocks during late Triassic to early-middle Jurassic, with a little probably from metamorphic of late Permian.

Key words: Laoheishan Basin, Muling Formation, geochemistry, provenance attribute, tectonic background, analysis of provenance

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