Petrological and Geochemical Characteristics of Granodioritic Cryptoexplosion Breccia and Zircon SHRIMP Dating in the Baoshan Area, Hunan Province

Geoscience ›› 2005, Vol. 19 ›› Issue (2): 198-204.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Petrological and Geochemical Characteristics of Granodioritic Cryptoexplosion Breccia and Zircon SHRIMP Dating in the Baoshan Area, Hunan Province

WU Guang-ying^1,2, MA Tie-qiu³, BAI Dao-yuan³, LI Jin-dong^1,3, CHE Qin-jian^1,3, WANG Xian-hui³

1 School of Earth Sciences & Resources, China University of Geosciences, Beijing100083, China;
2 Yichang Institute of Geology and Mineral Resources, Yichang, Hubei443003, China;
3 Hunan Bureau of Geology and Mineral Resources Exploration and Development, Changsha, Hunan410011, China

Received:2004-11-28 Revised:2005-03-06 Online:2005-02-20 Published:2005-02-20

Abstract

Abstract:

The study on the cryptoexplosion breccia in petrology and geochemistry indicates that the breccia and matrix are high potassium calc-alkaline metaluminous granodiorite, which formed through crust-mantle interaction.Zircon SHRIMP dating shows that breccia of granodriorite yields ²⁰⁷Pb/²⁰⁶Pb age of 164.1±1.9 Ma, and matrix of granodiorite yields 162.2±1.6 Ma. Both breccia and matrix almost formed at the same time. Petrological and geochemical characteristics of granodioritic cryptoexplosion breccia are the same as ore-bearing granodiorite porphyry. The contents of metallogenic elements, such as W, Mo, Cu, Pb, Zn, etc., are very high in the breccia and matrix. And there are some polymetallic mineralizations in the boundary between granodioritic cryptoexplosion breccia and country rocks. It infers that granodioritic cryptoexplosion breccia may be the ore-bearing parent rock as well.So this has a very important significance to exploring more polymetallic ore deposits in the research area.

Key words: granodioritic cryptoexplosion breccia, petrological and geochemical characteristics, zircon SHRIMP dating, Baoshan, Hunan

CLC Number:

P588.1

WU Guang-ying,MA Tie-qiu,BAI Dao-yuan,LI Jin-dong,CHE Qin-jian,WANG Xian-hui. Petrological and Geochemical Characteristics of Granodioritic Cryptoexplosion Breccia and Zircon SHRIMP Dating in the Baoshan Area, Hunan Province [J]. Geoscience, 2005, 19(2): 198-204.

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Petrological and Geochemical Characteristics of Granodioritic Cryptoexplosion Breccia and Zircon SHRIMP Dating in the Baoshan Area, Hunan Province

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