...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules
【24h】

Oxygen isotope systematics of crystalline silicates in a giant cluster IDP: A genetic link to Wild 2 particles and primitive chondrite chondrules

机译：巨大簇IDP中结晶硅酸盐的氧同位素系统：野生2颗粒的遗传连杆和原始的Chondrite软骨压力合物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Anhydrous interplanetary dust particles (IDPs) collected from Earth's stratosphere are the most primitive extraterrestrial materials that likely are the remnants of major building blocks of our solar system. While they probably originated from icy outer solar system comets, this hypothesis needs to be further verified via comparison with Wild 2 (a Jupiter-family comet) particles returned by the Stardust mission. Besides, the origins of their components can be further constrained by comparing with materials in primitive chondrite. Here we investigate the petrology and oxygen isotope systematics of 20 fragments extracted from a giant cluster IDP U2-20GCA. Fifteen are monomineralic or polymineralic fragments composed of olivine and/or pyroxene. Others are plagioclase/glass bearing fragments similar to barred-olivine chondrules, enstatite-rich chondrules, and Al-rich chondrules (ARC). They show a range of Mg# [mol% Mg/(Mg+Fe)] in olivine and pyroxene (99-75) and MnO and Cr2O3 abundances in olivine that resemble Wild 2 particles. Individual fragments have relatively O-16-poor oxygen isotope ratios with delta O-18 and delta O-17 varying from -6.2 +/- 1.0 parts per thousand to 6.8 +/- 1.9 parts per thousand and -6.7 +/- 2.6 parts per thousand to 5.3 +/- 1.2 parts per thousand, respectively. Most fragments show Delta O-17 (= delta O-17-0.52 x delta O-18) increasing from similar to-3-parts per thousand to similar to 0 parts per thousand with decreasing Mg#, similar to those observed in Wild 2 particles and CR chondrite chondrules. Four fragments (including the ARC-like fragment) show oxygen isotope signatures of ordinary (O), R, or CH-CB chondrite chondrules. The similarities among the giant cluster IDP, Wild 2 particles, and primitive chondrite chondrules demonstrate (i) a cometary origin of anhydrous IDPs; (ii) the major source of crystalline silicates in comets is likely to be CR chondrite chondrule-like materials, while minor sources include O, R, or CH-CB chondrite chondrule-like materials. The conclusions support the hypothesis that anhydrous IDPs sampled extremely heterogeneous materials formed in wide solar system regions like Wild 2 particles. (C) 2021 Elsevier B.V. All rights reserved.
机译：从地球平流层收集的无水行星际尘埃粒子（IDPs）是最原始的地外物质，可能是太阳系主要组成部分的残余物。虽然它们可能起源于冰冷的太阳系外彗星，但这一假设需要通过与星尘任务返回的Wild 2（木星家族彗星）粒子进行比较来进一步验证。此外，通过与原始球粒陨石中的材料进行比较，可以进一步限制其成分的来源。在这里，我们研究了从一个巨大的团簇IDP U2-20GCA中提取的20个碎片的岩石学和氧同位素系统学。15种是由橄榄石和/或辉石组成的单矿物或多矿物碎片。其他为斜长石/含玻璃碎片，类似于棒状橄榄石球粒、富顽辉石球粒和富铝球粒（ARC）。它们显示了橄榄石和辉石（99-75）中的Mg#[mol%Mg/（Mg+Fe）]范围，以及橄榄石中类似Wild 2颗粒的MnO和Cr2O3丰度。单个碎片的氧同位素比值相对较低，δO-18和δO-17的变化范围分别为-6.2+/-1.0‰到6.8+/-1.9‰和-6.7+/-2.6‰到5.3+/-1.2‰。大多数碎片显示δO-17（=δO-17-0.52 xδO-18）从类似于千分之-3增加到类似于千分之0，Mg#减少，类似于在野生2颗粒和铬球粒陨石球粒中观察到的那些。四个碎片（包括弧形碎片）显示了普通（O）、R或CH-CB球粒陨石球粒的氧同位素特征。巨型团状IDP、野生2粒子和原始球粒陨石球粒之间的相似性表明（i）无水IDP的彗星起源；（ii）彗星中结晶硅酸盐的主要来源可能是CR球粒陨石类材料，而次要来源包括O、R或CH-CB球粒陨石类材料。这些结论支持这样的假设，即无水IDPs采样了在广泛的太阳系区域形成的极不均匀物质，如Wild 2粒子。（c）2021爱思唯尔B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号