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The Early Jurassic magmatism in northern Guangdong Province, southeastern China: Constraints from SHRIMP zircon U-Pb dating of Xialan complex 被引量:11
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作者 YU XinQi DI YongJun +3 位作者 WU GanGuo ZHANG Da ZHENG Yong DAI YanPei 《Science China Earth Sciences》 SCIE EI CAS 2009年第4期471-483,共13页
This paper reports SHRIMP zircon U-Pb ages of 196±2 Ma for granite, and 195±1 Ma for gabbro from the Xialan complex in the Meizhou area, northern Guangdong Province. These results shed new light on the calm ... This paper reports SHRIMP zircon U-Pb ages of 196±2 Ma for granite, and 195±1 Ma for gabbro from the Xialan complex in the Meizhou area, northern Guangdong Province. These results shed new light on the calm stage of magmatic activity in southeastern China during 200-180 Ma, and revealed that the back-arc extension induced by the subduction of the western Pacific plate may have begun at 195 Ma at least. Field observation on the fresh outcrops allows us to recognize some features formed by magma mixing. A part of the gabbro has a fine-grained rim of 20-30 cm at the margin, and thins gradually to-ward the granite; numerous dark fine-grained to microcrystalline dioritic enclaves developed in the granite. These enclaves vary in shape and size, dark minerals concentrated at the margin of enclaves, and the contact between enclaves and host rock is either obvious or obscure, or gradational. In addi-tion, needle-shaped apatites are included in the enclaves. The REE patterns of gabbros, as well as the trace element patterns, are generally consistent with those of granitic rocks. The above characters further suggest that in the Early Jurassic the injection of basic magma had melted deep continental crust and produced acidic magma, and the Xialan complex was produced by the mixing of them. 展开更多
关键词 xialan COMPLEX SHRIMP zircon U-PB ages MAGMA mixing the Early JURASSIC Meizhou NORTHERN Guangdong Province
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兴宁市霞岚矿区风化壳型钒钛磁铁矿矿物特征研究
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作者 钟立 《中国资源综合利用》 2024年第8期92-96,共5页
兴宁市霞岚矿区风化壳型钒钛磁铁矿是一座多金属矿床,储量规模较大。以该钒钛磁铁矿为例,对主要矿物和脉石矿物的特征进行研究,测定矿石中主要矿物的解离度,分析其有益组分及含矿率,可以为矿石开采与选冶加工提供指导。
关键词 风化壳型 钒钛磁铁矿 矿物特征 兴宁市霞岚矿区
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广东省兴宁市霞岚—永和钒钛磁铁矿带成矿地质特征 被引量:3
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作者 孙强辉 杨祝良 +2 位作者 陈荣 李庆环 邢光福 《资源调查与环境》 2002年第4期266-271,共6页
在广东省梅州兴宁盆地霞岚—永和一带,产出中国东部罕见的、与早侏罗世层状镁铁—超镁铁质杂岩体有关的大型钒钛磁铁矿(铬铁矿)矿床,具有重要的科学和经济价值。本文介绍了霞岚—永和钒钛磁铁矿成矿带的地质特征,从成矿带沉积建造、区... 在广东省梅州兴宁盆地霞岚—永和一带,产出中国东部罕见的、与早侏罗世层状镁铁—超镁铁质杂岩体有关的大型钒钛磁铁矿(铬铁矿)矿床,具有重要的科学和经济价值。本文介绍了霞岚—永和钒钛磁铁矿成矿带的地质特征,从成矿带沉积建造、区域构造和岩浆活动等方面阐述了成矿带的形成条件及控矿因素,并指出了成矿带远景、找矿目标及其科学意义。 展开更多
关键词 广东 兴宁市 地质特征 矿床特征 霞岚-永和钒钛磁铁矿成矿带 成矿条件
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