中国海南島産テクタイトの希ガス組成と含水量について

概要

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We investigated contents of the noble gas and water of tektite-like materials collected from several localities within Hainan Island, China. The island is located in the northern edge of the Australasian strewn filed, and has been known as providing different types of tektites. One of the major objectives of this study is to identify the samples as tektites and to classify them into subtypes based on the analytical results. Noble gas compositions, as expected for tektites, are characterized by neon enrichment, while the Ne/Ar ratios are smaller than that of normal-type tektites, indicating consistent feature to that of previously reported Muong Nong-type tektites. Range of water contents agrees with those reported for Muong Nong-type tektites. Together with apparent morphological similarities between our samples and Muong Nong-type tektites, our results provide strong evidence to conclude that the studied samples are Muong Nong-type tektites. Since the Muong Nong-type tektites are formed relatively closer to impact craters, our findings and further studies on the Muong Nong-type tektites will help to narrow out the possible location of the source crater of the Australasian tektites.
日本地球化学会の論文
2010-06-25