Geological Characteristics and Their Tectonic Significance of Early Cretaceous Lingdi Caldera in Guangfeng County, Jiangxi Province
详细信息
- 责任者：Tang Chunhua (Geological Survey of Jiangxi Province ; Nanchang 330030 ; China) ; Zhang Fushen
- 刊名：Resources Survey & Environment
- 出版年：2013
- 卷期：34(2)
- 关键词：破火山口 ; calderas ; 江西 ; Jiangxi Province
- 页码：p.80-88
- 图表：9 illus., 2 tables, 20 refs.
- 分类号：0801
- issnNo：ISSN1671-4814
- isbnNo：CN32-1640/N
摘要
The early Cretaceous Lingdi caldera in Guangfeng county,Jiangxi Province,is st udied in this paper,taking the Juntanshan-Lingdi measured geological profile a s the key section,and the volcanic sequence of the third subcycle of Zhongdun Fo rmation volcanic cycle porphyries are defined,and the types and combinations of volcanic lithofacies are devided.By studying on the strata,lithofacies,petro logy and geochemistry of the samples from the key section,the genesis mechanism of volcanic facies and types of volcanic eruptions are discussed and the tecton ic environment of volcanism-intrusion are approached.It is considered that the Lingdi volcanic rocks belong to aluminous A-type rhyolites,formed in an enviro n ment of compression transforming to tension,providing geological evidences for studying on Tongbashan granitic volcanic-intrusive rocks and their regional mag m atic tectonic evolution.