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Tectonic and geochemical characteristics and reserved conditions of a mantle source gas accumulation zone in eastern China

Tectonic and geochemical characteristics and reserved conditions of a mantle source gas... Along both sides of the Tancheng-Lujiang Fracture Zone in eastern China, a series of mantle source gas pools constitute a massive-scale tectonic accumulation zone in NNE direction, with the mantle geochemical characteristics of high concentrations of C0 2 and He, high 3 He/ 4 He- 40 Ar/ 36 Ar ratio system and high δ 13 Coo 2 ratios (the main frequency, -3.4%— 4.6%), showing no difference from the tectonic framework of the area. In the area, the tectonic environment is a rift formed as a result of diapiric mantle injection and crust thinning to form graben-type basins and lithospheric fractures. The mantle-derived volcanic rocks and inclusions are well-developed and a high geothermal zone (mantlesource) exists in the area. The characteristics of the three components (solid, liquid and gas) of mantle, concentrated all over the same tectonic space zone, show that the rift system is of a good tectonic environment or passage for mantle degassing and gas migration. The main types of the gas pools are volcano, fault-block, anticline, buried hill and so on, but most of them are combination traps closely related with fracture. For the mantle source gas pools, rift is an optimum tectonic region, and nearby lithospheric fracture, mantle source volcanic rocks or basement uplifts are a favourable structural location when reservoir-caprock association develops. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Science in China Series D: Earth Sciences Springer Journals

Tectonic and geochemical characteristics and reserved conditions of a mantle source gas accumulation zone in eastern China

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References (3)

Publisher
Springer Journals
Copyright
Copyright © 1997 by Science in China Press
Subject
Geosciences; Geosciences, general
ISSN
1006-9313
eISSN
1862-2801
DOI
10.1007/BF02878583
Publisher site
See Article on Publisher Site

Abstract

Along both sides of the Tancheng-Lujiang Fracture Zone in eastern China, a series of mantle source gas pools constitute a massive-scale tectonic accumulation zone in NNE direction, with the mantle geochemical characteristics of high concentrations of C0 2 and He, high 3 He/ 4 He- 40 Ar/ 36 Ar ratio system and high δ 13 Coo 2 ratios (the main frequency, -3.4%— 4.6%), showing no difference from the tectonic framework of the area. In the area, the tectonic environment is a rift formed as a result of diapiric mantle injection and crust thinning to form graben-type basins and lithospheric fractures. The mantle-derived volcanic rocks and inclusions are well-developed and a high geothermal zone (mantlesource) exists in the area. The characteristics of the three components (solid, liquid and gas) of mantle, concentrated all over the same tectonic space zone, show that the rift system is of a good tectonic environment or passage for mantle degassing and gas migration. The main types of the gas pools are volcano, fault-block, anticline, buried hill and so on, but most of them are combination traps closely related with fracture. For the mantle source gas pools, rift is an optimum tectonic region, and nearby lithospheric fracture, mantle source volcanic rocks or basement uplifts are a favourable structural location when reservoir-caprock association develops.

Journal

Science in China Series D: Earth Sciences – Springer Journals

Published: Feb 1, 1997

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