We report unearthing the first silicate-type(S-type)lunar Antarctic micrometeorites(AMM)spherule and another spherule with a refractory chondritic phase.The lunar spherule is made of Augite with minor Ni magnetite(<...We report unearthing the first silicate-type(S-type)lunar Antarctic micrometeorites(AMM)spherule and another spherule with a refractory chondritic phase.The lunar spherule is made of Augite with minor Ni magnetite(<1 wt.%),in contrast to other known cosmic spherules.The Augite’s minor oxide range in the spherule are as follows:Wo_(37-41)En_(25-27)Fs_(34-36),Al_(2)O_(3):0.7–1 wt.%,Cr_(2)O_(3):0.01–0.06 wt.%,MnO:0.32–0.39 wt.%and TiO_(2):0.03–0.09 wt.%.The lunar spherule’s chemical characteristics indicate that it originated from very low Ti lunar basalt(VLT)mare basalts.Chondritic diopside(Wo_(46-47)En_(50-47)Fs_(5-6),Al_(2)O_(3):1.7–1.6 wt.%,Cr_(2)O_(3):0.6–0.63 wt.%,MnO:0.2–0.4 wt.%,and TiO_(2):0.0–0.02 wt.%)makes up the refractory phase in the second spherule.The chemical composition of diopside is indistinct from those of calcium aluminium inclusion(CAIs)found in both ordinary and carbonaceous chondrites.Our finding reveals that micron-sized lunar impact debris can potentially reach the Earth’s surface,similar to the earliest formed nebulae solid component.展开更多
基金The GEOSINKS,PMN-Ministry of Earth Sciences,and the ISRO-Respond project support this workthe UGC-Council of Scientific and Industrial Research for financial support.This is NIO’s contribution no.7330.
文摘We report unearthing the first silicate-type(S-type)lunar Antarctic micrometeorites(AMM)spherule and another spherule with a refractory chondritic phase.The lunar spherule is made of Augite with minor Ni magnetite(<1 wt.%),in contrast to other known cosmic spherules.The Augite’s minor oxide range in the spherule are as follows:Wo_(37-41)En_(25-27)Fs_(34-36),Al_(2)O_(3):0.7–1 wt.%,Cr_(2)O_(3):0.01–0.06 wt.%,MnO:0.32–0.39 wt.%and TiO_(2):0.03–0.09 wt.%.The lunar spherule’s chemical characteristics indicate that it originated from very low Ti lunar basalt(VLT)mare basalts.Chondritic diopside(Wo_(46-47)En_(50-47)Fs_(5-6),Al_(2)O_(3):1.7–1.6 wt.%,Cr_(2)O_(3):0.6–0.63 wt.%,MnO:0.2–0.4 wt.%,and TiO_(2):0.0–0.02 wt.%)makes up the refractory phase in the second spherule.The chemical composition of diopside is indistinct from those of calcium aluminium inclusion(CAIs)found in both ordinary and carbonaceous chondrites.Our finding reveals that micron-sized lunar impact debris can potentially reach the Earth’s surface,similar to the earliest formed nebulae solid component.
