{"_buckets": {"deposit": "7c88de12-8254-478d-8596-5de2f46e49e9"}, "_deposit": {"id": "10621", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "10621"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00010621"}, "item_12_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1984-11-12", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "item_12_date_granted_64": {"attribute_name": "\u5b66\u4f4d\u6388\u4e0e\u5e74\u6708\u65e5", "attribute_value_mlt": [{"subitem_dategranted": "1984-11-12"}]}, "item_12_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Carbon isotope fractionation between coexisting calcite and graphite ( \u0394^13Ccc-gr ) has been determined in metamorphosed limestones and calc-silicate rocks from the Ryoke metamorphic\nbelt in the northern Kiso district. In this district, the Ryoke metamorphic rocks ranging from the lower greenschist facies to the upper amphibolite facies are widely distributed.\nThe fractionation of 13^C/12^C between calcite and graphite decreases regularly with increase of the metamorphic grade and it is independent of absolute \u03b4^13C values of calcite.\nThese lines of evidence suggest that carbon isotopic exchange equilibrium has been attained during the metamorphism even in the greenschist facies and isotopic modification possibly\ncaused by retrogressive metamorphism is not distinguished. For T= 270\u00b0- 650\u2103, the fractionation is expressed by the following equation :\n\u0394^13Ccc-gr=8.9\u00d710^6T^-2-7.1 ( T in \u00b0K ).\nThis equation has a slope steeper than the current results on the \u03b4^13Ccc-gr versus 10^6T^-2 diagram. It can be used as a potential geothermometer for almost the entire temperature\nrange of metamorphism.\n \u03b4^13C values of carbonaceous matter in unmetamorphosed limestones in this district are approximately -22%\uff61, which is due to its biogenic origin. Graphite from metamorphosed limestones is also considered to be of biogenic origin but\nshows enrichment of 13^C due to isotopic exchange with calcite.\n \u03b4^13C values of graphite as well as \u0394^13Ccc-gr confirm that the zone II represents the lowest grade zone of Ryoke metamorphism. The maximum equilibrium fractionation of \u03b4^13C between calcite\nand graphite is considered to be approximately 23%\uff61, which value corresponds to be 270\u2103. Below this temperature, it seems that carbon isotopic exchange between the minerals does not occur.\n Calcite in marble from the higher grade zones has\nrelatively lower \u03b4^13C and \u03b4^18O values. The depletion of heavy isotopes is considered to be caused by the loss of 13^C and 18^O enriched carbon dioxide during decarbonation reactions.\nFor oxygen, it is considered that isotopic exchange with metamorphic fluids plays an important role in lowering the \u03b4^18O value of calcite in some higher grade marbles.", "subitem_description_type": "Abstract"}]}, "item_12_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\u540d\u53e4\u5c4b\u5927\u5b66\u535a\u58eb\u5b66\u4f4d\u8ad6\u6587 \u5b66\u4f4d\u306e\u7a2e\u985e:\u7406\u5b66\u535a\u58eb(\u8ad6\u6587) \u5b66\u4f4d\u6388\u4e0e\u5e74\u6708\u65e5: \u662d\u548c59\u5e7411\u670812\u65e5", "subitem_description_type": "Other"}]}, "item_12_dissertation_number_65": {"attribute_name": "\u5b66\u4f4d\u6388\u4e0e\u756a\u53f7", "attribute_value_mlt": [{"subitem_dissertationnumber": "13901\u4e59\u7b2c2705\u53f7"}]}, "item_12_identifier_60": {"attribute_name": "URI", "attribute_value_mlt": 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