排序方式： 共有4条查询结果，搜索用时 0 毫秒
1
1.
LI Huan XI Xiaoshuang SUN Huashan KONG Hu WU Qianhong WU Chengming Jillian Aira S. GABO-RATIO 《《地质学报》英文版》2016,90(2):704-721
The Batang Group in the Zhaokalong area not only hosts an important Fe-Cu polymetallic deposit but also reveal important insights for the Late Triassic tectonism in the northern Sanjiang region. In order to delineate the tectonic setting and evolutionary process of the paleo arc-basin system, geochemical studies on the Batang Group strata have been carried out. The results suggest that andesite in the Zhaokalong area mainly belongs to the tholeiite series and is characterized by obvious fractionation of LREE and HREE, enrichment in LILE and depletion in HFSE, and a distinctly elevated δ~(34)SCDT average of 10.5‰. The sandstone is classified as lithic sandstone, which is also characterized by obvious fractionation of LREE and HREE, as well as weak negative Ce and Eu anomalies. The limestone displays positive Eu anomalies, with δ~(13)CPDB ranging from-1.3‰ to 4.4‰ and δ~(18) OSMOW ranging from 14.6‰ to 22.5‰. These results indicate that the andesite has a dual signature of both arc andesite and rift volcanic rocks, whereas the sandstone may be formed in an active continental margin, and the limestone could be deposited in a weak oxidizing shallow sea. The sandstone in the Zhaokalong area represents sedimentation in a platform slope facies, corresponding to the main stage of the Jinshajing oceanic basin subduction during the middle period of Late Triassic. The continental arc volcanic activity resulted from subsequent strengthened subduction, forming the andesite in the North Qiangtang backarc basin. Afterwards, the limestone was formed after the cessation of magmatic activity. The information gleaned from the Batang Group strata helped constrain the evolution of the paleo-Jomda island arc and Jinshajiang oceanic subduction in the Late Triassic. 相似文献
2.
The ore types of the Zhaokalong Fe-Cu deposit are divided into two categories: sulfide-type and oxide-type. The sulfide-type ore include siderite ore, galena-sphalerite ore and chalcopyrite ore, whereas the oxide-type ore include magnetite ore and hematite ore. The ore textures and structures indicate that the Zhaokalong deposit is of the sedimentary-exhalative mineralization type. Geochemical analyses show that the two ore types have a high As, Sb, Mn, Co and Ni content. The REE patterns reveal an enrichment of the LREE compared to the HREE. Isotopic analysis of siderite ore reveal that the δ13CPDB ranges from 2.01 to 3.34 (‰) whereas the δ18O SMOW ranges from 6.96 to 18.95 (‰). The fluid inclusion microthermometry results indicate that homogenization temperatures of fluid inclusions in quartz range from 131 to 181℃, with salinity values of 1.06 to 8.04 wt% NaCl eq. The mineralizing fluid therefore belongs to the low temperature - low salinity system, with a mineralizing solution of a CO2-Ca2+(Na+, K+)-SO42-(F-, Cl-)-H2O system. The geochemical results and fluid inclusion data provide additional evidence that the Zhaokalong deposit is a sedex-type deposit that experienced two stages of mineralization. The sulfide mineralization probably occurred first, during the sedimentary exhalative process, as exhibited by the abundance of marine materials associated with the sulfide ores, indicating a higher temperature and relatively deoxidized oceanic depositional environment. After the main exhalative stage, hydrothermal activity was superimposed to the sulfide mineralization. The later stage oxide mineralization occurred in a low temperature and relatively oxidized environment, in which magmatic fluid circulation was dominant. 相似文献
3.
青海玉树赵卡隆铁铜多金属矿床地质特征及成因探讨 总被引：2，自引：0，他引：2
赵卡隆铁铜多金属矿床产于三叠纪末期江达弧后裂谷热水沉积盆地中,具有铁、铜、金、铅锌等多金属矿化.矿体赋存于三叠系巴塘群上部碎屑岩组上岩性段地层中,严格受地层和岩性控制.各矿(体)群根据矿体分布部位不同划分为若干条矿体.火山喷发活动(安山岩)为成矿提供了物质来源和热源,同期火山岩具有富铝钠质低钾质特征,属安山岩类-拉斑玄... 相似文献
4.
青海赵卡隆铁多金属矿床处于三江成矿带北西段,矿体赋存于上三叠统巴塘群上部碎屑岩组、安山岩的上下盘,严格受地层控制,呈层状、似层状和透镜状顺层展布,矿体与围岩无明显界限,呈渐变过渡关系。初步研究认为矿床属火山喷流沉积—改造型铁多金属矿床。 相似文献
1