东准噶尔北缘老山口铁-铜-金矿床古生代岩浆岩锆石U-Pb年代学、氧逸度特征及地质意义
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摘要
老山口矿床位于新疆东准噶尔北缘,是区域内重要的铁-铜-金矿床。矿区内岩浆岩发育广泛,对其中的奥陶纪玄武安山岩(约449Ma),奥陶纪安山岩(约447Ma),泥盆纪火山岩(393~376Ma)、二长闪长岩(约379Ma)、黑云母闪长岩(约379Ma)、石英正长岩(约376 Ma)、细粒闪长岩(约370 Ma),石炭纪碱性花岗岩(约330Ma)和粗粒闪长玢岩(约310Ma)进行了成岩年代学的统计和测试,结果表明老山口矿床存在3期岩浆活动:450~440Ma、约390~370Ma以及330~310Ma。结合区域构造演化可知,其中450~440 Ma和390~370Ma的岩浆活动形成于不同时期俯冲相关的岛弧环境,而330~310Ma的岩浆活动则形成于后碰撞-板内伸展环境。根据铜-金矿化的时代,可将矿区内的岩浆岩分为3期:成矿前、同成矿及成矿后。老山口同成矿期岩浆岩(泥盆纪火山岩、二长闪长岩、闪长玢岩和黑云母闪长岩)具有相对较高的(Eu/Eu*)N、(Ce/Ce*)N和CeⅣ/CeⅢ值,分别为0.13～0.86、1.14～445.92和33.34～1 165.04,说明铁-铜-金矿化与高氧逸度的岩浆活动有关。
The Laoshankou deposit is an important Fe-Cu-Au deposit in the northern margin of the East Junggar,NW China.LA-ICP-MS U-Pb dating of zircon constrains the timing of crystallization of Ordovician basaltic andesite(~449 Ma),Ordovician andesite(~447 Ma),Devonian volcanic rocks(393-376 Ma),monzodiorite(~379 Ma),biotite diorites(~379 Ma),quartz syenites(~376 Ma),fine-grained diorite(~370 Ma),alkali granite(~330 Ma)and coarse-grained diorite porphyry(~310 Ma).Zircon dating indicates three periods of magmatism in Laoshankou:450-440 Ma,~390-370 Ma and 330-310 Ma.The magmatism for the first two periods occurred in a subduction-related island arc setting;the magmatism for the last one occurred in a post-collision or inplate extensive setting.Pre-,syn-and post-mineralization volcanic and intrusive rocks are divided based on the Fe-Cu-Au mineralization timing.Syn-mineralization intrusions in Laoshankou have relatively high(Eu/Eu*)N,(Ce/Ce*)Nand CeIV/CeIII values of 0.13-0.86,1.14-445.92 and 33.34-1165.04,respectively,indicating Fe-Cu-Au mineralization was associated with high oxygen fugacity magmatism.
The Laoshankou deposit is an important Fe-Cu-Au deposit in the northern margin of the East Junggar,NW China.LA-ICP-MS U-Pb dating of zircon constrains the timing of crystallization of Ordovician basaltic andesite(~449 Ma),Ordovician andesite(~447 Ma),Devonian volcanic rocks(393-376 Ma),monzodiorite(~379 Ma),biotite diorites(~379 Ma),quartz syenites(~376 Ma),fine-grained diorite(~370 Ma),alkali granite(~330 Ma)and coarse-grained diorite porphyry(~310 Ma).Zircon dating indicates three periods of magmatism in Laoshankou:450-440 Ma,~390-370 Ma and 330-310 Ma.The magmatism for the first two periods occurred in a subduction-related island arc setting;the magmatism for the last one occurred in a post-collision or inplate extensive setting.Pre-,syn-and post-mineralization volcanic and intrusive rocks are divided based on the Fe-Cu-Au mineralization timing.Syn-mineralization intrusions in Laoshankou have relatively high(Eu/Eu*)N,(Ce/Ce*)Nand CeIV/CeIII values of 0.13-0.86,1.14-445.92 and 33.34-1165.04,respectively,indicating Fe-Cu-Au mineralization was associated with high oxygen fugacity magmatism.
引文
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