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NaAlSi_3._8-hollandite and other high-pressure minerals in the shock melt veins of the Suizhou meteorite

Chinese Science Bulletin 2001年第13期46卷 1121-1126页

作者： xie xiande, chen ming,{2., Chinese Academy of Sciences, {3. 510640, china 2. Max-Planck-institute fur Chemie, 5512. Mainz, Germany guangzhou institute of {2. Chinese Academy of Sciences Guangzhou 510640 China Max-Planck-institute für Chemie 55128 Mainz Germany

The Suizhou L6 chondrite contains a few very thin shock melt veins of 0.02.0.09 mm in width. In spite of small width of the veins, shock-induced high-pressure phases, such as coarse-grained NaAlSi3.8-hollandite, ringwoodite, majorite and fine-grained matrix majorite-pyropess have been discovered in these veins. NaAlSi3.8-hollandite, the high-pressure phase of plagioclase, in Suizhou shock veins occurs as a single phase mineral, no silicate glassy phase, such as albitic glass, was incorporated with it. The presence of above-mentioned high-pressure phases constrains the high pressure (up to 2.-2. GPa) and high temperature (up to 1900-2.00℃) regime in Suizhou shock veins, and indicates that the duration of high-pressure regime in the veins should be long enough (a few seconds) for phase transformation and crystallization of minerals under pressure. The discovery of the first natural single-phase crystalline NaAlSi3.8- holland-ite in Suizhou meteorite is of important significance in understanding the Earth’

关键词： high NaAlSi3.8-hollandite and other high-pressure minerals in the shock melt veins of the Suizhou meteorite

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Nano SIMS analysis of organic carbon from the Tissint Martian meteorite:Evidence for the past existence of subsurface organic-bearing fluids on Mars

Nano SIMS analysis of organic carbon from the Tissint Martia...

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中国科学院地质与地球物理研究所2.14年度（第14届）学术年会

作者： Yangting LIN Ahmed el goresy Sen HU Jianchao ZHANG Philippe GILLET Yu{2. XU Jialong HAO Masaaki MIYAHARA Ziyuan OUYANG Eiji OHTANI Lin XU Wei YANG Lu FENG Xuchao ZHAO Jing YANG Shin OZAWA Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of Sciences Bayerisches Geoinstitüt Universitt Bayreuth EPFL CH-1015LausanneSwitzerland institute of geochemistry CAS National Astronomical Observatories CAS guangzhou institute of {2. CAS

Two petrographic settings of carbonaceous components,mainly filling open fractures and occasionally enclosed in shock-melt veins,were found in the recently fallen Tissint Martian *** presence in shock-melt veins and the deuterium enrichments(d D up to+1183.)of these components clearly indicate a pristine Martian *** carbonaceous components are kerogen-like,based on micro-Raman spectra and multielemental ratios,and were probably deposited from fluids in shock-induced fractures in the parent rock of *** precipitation of the organic matter,the rock experienced another severe shock event,producing the melt veins that encapsulated a part of the organic *** C isotopic compositions of the organic matter(d13.=à12.8 toà3..1&)are significantly lighter than Martian atmospheric CO2.nd carbonate,providing a tantalizing hint for a possible biotic ***,the organic matter could be derived from carbonaceous chondrites,as insoluble organic matter from the latter has similar chemical and isotopic *** presence of organic-rich fluids that infiltrated rocks near the surface of Mars has significant implications for the study of Martian paleoenvironment and perhaps to search for possible ancient biological activities on Mars.

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