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| 1 | 甘肃寨上金矿床含金石英脉中锆石SHRIMP法U-Pb同位素测定及地质意义显示文摘寨上金矿床为西秦岭近年来新发现的大型微细粒浸染型金矿床。矿区出露的地层以泥盆系、二叠系为主,受近SN向挤压作用影响,普遍发生褶皱变形作用。对寨上金矿3件含金石英脉中的锆石样品的SHRIMP法U-Pb同位素年龄实验,结果表明:锆石U-Pb年龄有4个集中分布区间,分别为:1800~2000Ma、800~1000Ma、400~500Ma、300Ma;石英脉中的锆石均为捕获围岩的锆石,没有发现热液锆石;锆石U-Pb同位素年龄印证了矿区及外围缺失二叠系以后古生界及中生界的地层或岩浆岩。 | 李文良 陈勇敢 赵玉锁 张国利 张玉杰 路彦明 | 2006 | 黄金2006，27，7： | 14 |
| 2 | U-Pb geochronology of hydrothermal zircon from the Mesoproterozoic Gaoyuzhuang Formation on the northern margin of the North China Block and its geological implications显示文摘This paper reports LA-ICP-MS zircon U-Pb ages and REE compositions on detrital zircons (Type 1) and hydrothermal zircons (Type 2) from low-metasedimentary rocks in the Mesoproterozoic Gaoyuzhuang Formation,Pingquan area,Hebei Province that provide important constraints on the tectonic evolution along the northern margin of the North China Block.The detrital zircons are characterized by an oscillatory magmatic core,surrounded by a narrow structureless rim in CL images.They yield 207Pb/206 Pb ages ranging from 1703 to 2543 Ma with two age peaks at 2473 and 1794 Ma,which is consistent with the Neoarchean and Paleoproterozoic tectono-thermal events recorded in the NCB basement,indicating that the source of the detritus was locally derived.By contrast,the hydrothermal ones are euhedral,sector zoning or internally structureless.They have relatively higher U and Th contents and Th/U ratios (U=139 2918 ppm,Th=35 1327 ppm,Th/U (average) =0.78 vs.U=15 1044 ppm,Th=8 341 ppm,Th/U (average) =0.57 for detrital zircons).Moreover,they are also enriched in REEs relative to detrital zircons and show a lower positive Ce anomaly (REE=659 2418 ppm vs.231 611 ppm for detrital zircon;Ce/Ce =2 13 vs.33 174 for detrital zircons),similar to known hydrothermal zircons derived from many locations.These characteristics,combined with our field petrographic observations,indicate that the hydrothermal zircons possibly formed from a low temperature aqueous fluid.Twelve concordant or near-concordant analyses on hydrothermal zircons yield weighted mean 206 Pb/238 U ages of 325 327 Ma,which provide unambiguous evidence that the northern NCB underwent late Paleozoic low temperature hydrothermal modification.This timing of this hydrothermal event is compatible with that of the late Paleozoic magmatic and metamorphic-deformational events occurred on the northern margin of the NCB,it appears likely that the hydrothermal activity resulted from southward subduction of the Paleo-Asian Oceanic plate underneath the NCB during late Paleozoic. | GUO Hua DU YuanSheng YANG JiangHai GUO Liang | 2011 | Science China Earth Sciences2011，54，11： | 1 |
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