Formation Mechanism of the Guidong CGB in North Guangdong Province and the Evolution of Melting Interfaces
详细信息
- 责任者：Li Hongwei (Department of Earth Sciences ; Sun Yat-Sen University ; Guangzhou 510275 ; China) ; Lou Feng
- 刊名：Earth Science Frontiers
- 出版年：2011
- 卷期：18(1)
- 关键词：深熔作用 ; anatexis ; 火成岩 ; igneous rocks ; 湖北 ; Hubei Province
- 页码：p.39-48
- 图表：8 illus., 5 tables, 28 refs.
- 分类号：0801
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
Re-encoding of the geological and geochemical data concerning the Guidong Composite Granite Body (CGB) with the hypothesis of in-situ melting and crustal convection suggests that the Guidong CGB was formed by repeated crustal melting of this area in the Mesozoic. On that basis, this paper rebuilds the melting interface (MI) formed in different Yanshanian periods: the MI formed in the Early Jurassic totally tilts from south to north, which resulted in the early Yanshanian granite cropping out from inner facies to transitional facies and to margin facies from south to north on the present-day denudation plane; the MI formed in the melting event of the Late Jurassic totally tilts from north to south,and the distribution of granite bodies formed in this period was basically limited within the old member of the Guidong CGB thus usually more acid than the old one. The melting event of the Early Cretaceous produced a southward tilting MI and formed two kinds of rocks, quartz syenite and subdacite-porphyry.
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