本文關鍵詞：新疆羅布泊東部發(fā)現球粒隕石雨　出處：《科學通報》2017年21期 　論文類型：期刊論文

  更多相關文章： 隕石散落區(qū) 沙漠隕石 三峰山 宇宙射線暴露年齡

【摘要】：新疆羅布泊以東65 km處的三峰山區(qū)域發(fā)現了隕石(Tuya 002~007)散落區(qū),呈3 km×11 km的橢圓狀.散落區(qū)內收集到130余塊普通球粒隕石,總重超過160 kg,最大的隕石重30 kg,最小的隕石重約15 g.散落區(qū)為一南東-北西向分布且隕石樣品逐漸增大的橢圓形區(qū)域,這意味著隕石從南東向以較低的角度進入地球大氣層.除Tuya002(760 g)外,散落區(qū)內的隕石可能來自同一次隕石雨,隕石類型為L5,沖擊程度為S2,風化程度為W3.Tuya 003的宇宙射線暴露年齡為45.6±4.4 Ma,因此三峰山隕石雨的流星體可能形成于約40 Ma時普通球粒隕石L群母體的破裂事件中.Tuya 002具有和其他三峰山隕石顯著不同的外表特征,表面熔殼全部脫落,球粒清晰可見,為L4型普通球粒隕石,樣品中有大量的硫酸鈣.其宇宙射線暴露年齡為17.0±4.1 Ma,也證明了其不是三峰山隕石雨的產物.三峰山區(qū)域隕石的研究表明三峰山區(qū)域不是隕石富集區(qū),而是L5普通球粒隕石散落區(qū).因此,需要對其他一些區(qū)域的隕石樣品進行礦物巖石學、風化特征、宇宙射線暴露年齡和居地年齡的研究,從而確定出新疆及其周邊沙漠區(qū)域的隕石富集區(qū).
[Abstract]:The meteorite Tuya 002 (007) scattered area was found in Sanfengshan region, 65 km east of Luoppo, Xinjiang. More than 130 ordinary chondrites with a total weight of more than 160 kg and a maximum weight of 30 kg were collected in the scattered area. The smallest meteorite weight is about 15 g. The scattered area is an elliptical area with an east-northwest distribution of meteorite samples and a gradual increase in the size of the meteorite samples. This means that meteorites enter the earth's atmosphere at a lower angle from south to east. Except for Tuya002(760 g, the meteorites in the scattered area may have come from the same meteorite rain, the type of meteorite is L5. The cosmic ray exposure age of W3.Tuya 003 is 45.6 鹵4.4 Ma. Therefore, the meteoroids of Sanfengshan meteorite rain may have formed in the rupture event of the ordinary chondrites L group at about 40 Ma. Tuya 002 has distinct appearance characteristics from the other three Fengshan meteorites. The surface melting crust is completely shedding, and the chondrites are clearly visible. They are ordinary chondrites of L4 type, and there is a large amount of calcium sulfate in the samples. The cosmic ray exposure age is 17.0 鹵4.1 Ma. It is also proved that it is not the product of Sanfeng Mountain meteorite rain. The study of meteorite in Sanfeng Mountain region shows that Sanfeng Mountain region is not a meteorite rich area, but a L5 common chondrites scattered area. It is necessary to study the mineral petrology, weathering characteristics, cosmic ray exposure age and residence age of meteorite samples from other regions, so as to determine the meteorite accumulation areas in Xinjiang and its surrounding desert areas.
【作者單位】： 中國科學院地球化學研究所月球與行星科學研究中心;中國科學院地球化學研究所環(huán)境地球化學國家重點實驗室;Physical
【基金】：國家自然科學基金(41273080,41473067和41490630)資助
【分類號】：P185.83
【正文快照】： 3.Physical Institute,University of Bern,Sidlerstrasse 5,CH-3012 Bern,Switzerland;4.新疆地質礦產勘查開發(fā)局第六地質大隊,哈密839000;5.中國科學院大學,北京100049*聯系人,E-mail:wangshijie@vip.skleg.cn國家自然科學基金(41273080,41473067和41490630)資助隕石是穿越

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