摘要
广西花山-姑婆山燕山期花岗岩体以高硅、高钾、富碱、低磷、准铝质为特征,具有较高的 TFeO/MgO 值,富集大离子亲石元素、高场强元素和稀土元素,普遍出现褐帘石,应归属于富钾的钙碱性花岗岩(KCG)系列岩石,相当于高钾钙碱性Ⅰ型花岗岩。产生于后造山陆内挤压向拉张转换的地球动力学背景下,其形成与岩石圈伸展-减薄、亏损地幔岩浆的上涌和富含金云母-钾质碱镁闪石的岩石圈地幔的部分熔融有关。
The Yanshanian Huashan-Guposhan granites in Guangxi are characterized by high silicon, high potassium, high alkaline, low phosphor and metaluminous nature, with relatively high FeO^T/MgO ratios and enrichment of LILE, HFSE and REE. In addition, they commonly contain allanites. They can thus be assigned to the high-potassium calc-alkaline granite （or KCG in the classification system of Barbarin, 1999）. They were formed during the conversion of the tectonic setting from compression to extension. The extension-thinning of lithosphere, the upwelling of the depleted mantle, and the partial melting of the lithospheric mantle rich in phlogopite and K-richterite might have served as the principal factors in producing this kind of granitic rocks.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2006年第2期97-109,共13页
Acta Petrologica et Mineralogica
基金
国家重点基础研究发展规划研究项目(1999CB403209)国家自然科学基金重点资助项目(40132010)
