东秦岭金堆城大型斑岩钼矿床LA ICP MS锆石U Pb定年及成矿动力学背景   总被引：31，自引：2，他引：29  

朱赖民  张国伟  郭波  李犇 《地质学报》2008,82(2):204-220

对出露东秦岭金堆城大型斑岩钼矿床北部的老牛山黑云二长花岗岩和金堆城含矿斑岩利用单颗粒锆石激光探针LA-ICP-MS定年技术进行了UPb精确定年和岩石地球化学对比研究。LA-ICPMS锆石UPb测年得到老牛山黑云二长花岗岩和金堆城含矿斑岩锆石加权平均年龄值分别为146.35±0.55Ma和140.95±0.45 Ma,与前人多次获得的金堆城钼矿床的辉钼矿Re-Os模式年龄141±4～127±7 Ma下限值一致,显示成矿与成岩同时或略滞后于岩体,成岩成矿发生于侏罗纪-白垩纪的同一成岩成矿系统中,与发生于1  相似文献   

闹牛山次火山岩铜矿靶区的遥感综合评价   总被引：2，自引：0，他引：2  

植起汉  王严  朱谷昌 《矿产与地质》1997,(3)

应用遥感技术及多源地学数据图像分析方法，提取闹牛山火山岩型铜多金属矿的遥感地质构造示矿要素，结合航磁异常、大功率激电异常和Ｃｕ、Ｍｏ、Ｐｂ、Ａｇ次生晕异常特征分析，提出闹牛山火山岩铜矿区北西侧和矿区南部是找矿的最佳目标地。  相似文献   

Geochronological,geochemical and mineralogical constraints on the petrogenesis of appinites from the Laoniushan complex,eastern Qinling,central China     

《Chemie der Erde / Geochemistry》2016,76(4):579-595

Appinites are commonly derived from a mantle source and are potentially significant in constraining the tectonic nature and evolution of ancient orogens, yet they have received little attention because of their limited outcrop. Here we investigate the newly identified appinitic rocks from the Laoniushan complex in the eastern Qinling Orogen. The appinites are composed of coarse-grained hornblendite, medium- and fine-grained hornblende-gabbro, and diorite porphyrite in the field occurrence. Winthin the appinitic rocks, the hornblendite displays features of cumulates. This study presents LA-ICP-MS zircon U-Pb data, mineral chemistry and whole rock geochemistry of the appinites. Zircons in the mafic to ultramafic rocks yield a U-Pb age of 152 ± 1Ma. The geochemistry of the rocks displays: lower SiO₂, higher Fe₂O₃^T and MgO contents, relatively flat chondrite normalized REE patterns with slight enrichment in light REE and a minor negative Eu anomaly; enrichment in large-ion lithophile elements(LILE, e.g. Rb, Ba, Sr and P), and depletion in high field strength elements(HFSE, e.g. Nb, Zr, Hf and Ti). Such geochemical features, together with crust-like bulk Sr-Nd isotopic compositions(initial ⁸⁷Sr/⁸⁶Sr ratios of 0.7057–0.7072, ε_Nd(t) = −17.2 to −9), suggest that the Laoniushan appinites likely originated from an ancient metasomatised mantle, followed by fractional crystallization in the petrogenetic process. The studied appinites were most likely generated in an intracontinental extensional environment in the Late Mesozoic.  相似文献