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Geology and Bouguer gravity anomalies of the Gulf of Tonkin and vicinity

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  • Fan, Pow-foong

Abstract

Outcrops of rock types around the Gulf of Tonkin range in age from Cambrian to Recent. The basement complex of the Gulf of Tonkin consists of Carboniferous carbonates and Lower Paleozoic metamorphic rocks. The Gulf of Tonkin and vicinity are comprised of three tectonic units: 1.(1) the Caledonian South China-North Vietnam Foldbelt,2.(2) the Variscan Southeastern Maritime Foldbelt and3.(3) the Indosinian Foldbelt of Vietnam. The Gulf of Tonkin subsided after the Cretaceous period. Up to 5 km of Tertiary sediments has accumulated in the Gulf of Tonkin. A distinct Bouguer gravity anomaly of +10 mgal is present in the middle of the Gulf of Tonkin and is also associated with shallow depth to Moho. Recent discovery of natural gas and oil in the Gulf of Tonkin may indicate major oil and gas fields.

Suggested Citation

  • Fan, Pow-foong, 1981. "Geology and Bouguer gravity anomalies of the Gulf of Tonkin and vicinity," Energy, Elsevier, vol. 6(11), pages 1099-1111.
    • Handle: RePEc:eee:energy:v:6:y:1981:i:11:p:1099-1111
    DOI: 10.1016/0360-5442(81)90028-1
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    1. Fan, Pow-Foong, 1985. "Geology and Bouguer anomalies of Hainan Island and vicinity," Energy, Elsevier, vol. 10(3), pages 331-340.

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