长江中下游大龙山和黄梅尖A型花岗岩锆石U-Pb年代学和Hf同位素
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摘要
长江中下游地区沿江两岸分布两条A型花岗岩带,岩性主要为石英正长岩和碱性花岗岩。为研究该地区A型花岗岩的形成时代和构造背景,分别选取具有代表性的北带大龙山和黄梅尖岩体的四组石英正长岩,进行LA-ICP-MS锆石U-Pb定年和Hf同位素研究,获得的锆石U-Pb年龄分别为(125.8±1.6)Ma和(126.4±3.5)Ma(大龙山)、(127.6±2.1)Ma和(127.2±2.1)Ma(黄梅尖),其对应的锆石εHf(t)值分别为-4～+1.1和-7.8～-3.6、-3.3～+2.1和-3.8～-0.1,二阶段模式年龄TDM2变化为1 107～1 433 Ma(平均值为1 264 Ma)和1 432～1 671 Ma(平均值为1 555 Ma)、1 045～1 389 Ma(平均值为1 265 Ma)和1 188～1 423 Ma(平均值为1 312 Ma)。结果表明两个岩体与长江中下游地区两条A型花岗岩带其他岩体的形成时代近乎一致,均形成于早白垩世。岩浆源区可能为一个富集地幔,伴随不同程度的地壳混染作用。结合前人的研究成果,大龙山和黄梅尖岩体可能形成于太平洋板块后撤而引发的强烈伸展的构造背景之下。
Two A-type granite belts,which are mainly composed of quartz syenites and alkali granites,are distributed along both sides of the Middle-Lower Yangtze Region. In order to study the forming age and tectonic setting of A-type granites in this area,in the present study,LA-ICP-MS zircon U-Pb dating and Hf isotope analyses were carried out for the quartz syenites from Dalongshan and Huangmeijian in north belt,respectively. The U-Pb data shows that the formation ages of the Dalongshan plutons are( 125. 8 ± 1. 6) Ma and( 126. 4 ± 3. 5) Ma,and the Huangmeijian plutons are( 127. 6 ± 2. 1) Ma and( 127. 2 ± 2. 1) Ma,respectively. Their corresponding zircon εHf( t) values are-4 to + 1. 1,-7. 8 to-3. 6,-3. 3 to + 2. 1 and-3. 8 to-0. 1 with TDM2 model ages of1 107 ～ 1 433 Ma( average 1 264 Ma) and 1 432 ～ 1 671 Ma( average 1 555 Ma),1 045 ～ 1 389 Ma( average1 265 Ma) and 1 188 ～ 1 423 Ma( average 1 312 Ma),respectively. The results indicate that Dalongshan and Huangmeijian plutons are formed in Early Cretaceous,which are contemporary with other plutons of the two A-type granite belts along the Middle-Lower Yangtze Region. The sources of magma likely stem from enriched mantle,which is accompanied by varying degrees of crustal material contamination and fractional crystallization. Based on the present studies,it is implied that the A-type granites from the Middle-Lower Yangtze Region including Dalongshan and Huangmeijian plutons are formed under lithospheric extension and thinning environment,which is related to the Pacific slab roll-back.
Two A-type granite belts,which are mainly composed of quartz syenites and alkali granites,are distributed along both sides of the Middle-Lower Yangtze Region. In order to study the forming age and tectonic setting of A-type granites in this area,in the present study,LA-ICP-MS zircon U-Pb dating and Hf isotope analyses were carried out for the quartz syenites from Dalongshan and Huangmeijian in north belt,respectively. The U-Pb data shows that the formation ages of the Dalongshan plutons are( 125. 8 ± 1. 6) Ma and( 126. 4 ± 3. 5) Ma,and the Huangmeijian plutons are( 127. 6 ± 2. 1) Ma and( 127. 2 ± 2. 1) Ma,respectively. Their corresponding zircon εHf( t) values are-4 to + 1. 1,-7. 8 to-3. 6,-3. 3 to + 2. 1 and-3. 8 to-0. 1 with TDM2 model ages of1 107 ～ 1 433 Ma( average 1 264 Ma) and 1 432 ～ 1 671 Ma( average 1 555 Ma),1 045 ～ 1 389 Ma( average1 265 Ma) and 1 188 ～ 1 423 Ma( average 1 312 Ma),respectively. The results indicate that Dalongshan and Huangmeijian plutons are formed in Early Cretaceous,which are contemporary with other plutons of the two A-type granite belts along the Middle-Lower Yangtze Region. The sources of magma likely stem from enriched mantle,which is accompanied by varying degrees of crustal material contamination and fractional crystallization. Based on the present studies,it is implied that the A-type granites from the Middle-Lower Yangtze Region including Dalongshan and Huangmeijian plutons are formed under lithospheric extension and thinning environment,which is related to the Pacific slab roll-back.
引文
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