Young asteroidal fluid activity revealed by absolute age from apatite in carbonaceous chondrite.
Young asteroidal fluid activity revealed by absolute age from apatite in carbonaceous chondrite.
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碳质球粒陨石中磷灰石的绝对年龄揭示了年轻的小行星流体活动
DOI：
10.1038/ncomms12844
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发表时间：
2016-09-29
影响因子：
16.6
通讯作者：
Wang, Ru-Cheng
中科院分区：
文献类型：
--
作者：
Zhang, Ai-Cheng;Li, Qiu-Li;Yurimoto, Hisayoshi;Sakamoto, Naoya;Li, Xian-Hua;Hu, Sen;Lin, Yang-Ting;Wang, Ru-Cheng
球粒陨石由早期太阳系(ESS)形成的物质组成，受到晚期热事件和流体活动的不同程度影响。确定ESS中流体活动的时间对于了解ESS中流体活动的性质、形成、演化和意义具有重要意义。以前的研究已经用短暂的同位素系统学确定了流体活动的相对年龄。本文报道了∼3.5型非碳质球粒陨石Dar al Gani(DAG)978中磷灰石的207Pb/206Pb等时线绝对年龄(4,450±50 Ma)。岩石学、矿物学和地球化学特征表明，DAG978中的磷灰石应该是在流体存在的变质作用中形成的。因此，磷灰石年龄代表了小行星环境中流体活动的绝对年龄。撞击事件可能提供了热量来激活ESS中的这种年轻的流体活动。
Chondritic meteorites, consisting of the materials that have formed in the early solar system (ESS), have been affected by late thermal events and fluid activity to various degrees. Determining the timing of fluid activity in ESS is of fundamental importance for understanding the nature, formation, evolution and significance of fluid activity in ESS. Previous investigations have determined the relative ages of fluid activity with short-lived isotope systematics. Here we report an absolute207Pb/206Pb isochron age (4,450±50 Ma) of apatite from Dar al Gani (DaG) 978, a type ∼3.5, ungrouped carbonaceous chondrite. The petrographic, mineralogical and geochemical features suggest that the apatite in DaG 978 should have formed during metamorphism in the presence of a fluid. Therefore, the apatite age represents an absolute age for fluid activity in an asteroidal setting. An impact event could have provided the heat to activate this young fluid activity in ESS.
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