Reconstruction of pre-breakup Paleozoic-suture of Gondowana continent in Australia

澳大利亚冈多瓦纳大陆裂解前古生代缝合带的重建

• 批准号: 04041012
• 负责人: WATANABE Teruo
• 金额: $ 8.96万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04041012/
• 关键词: New England Fold Belt; Lachlan Fold Belt; Eclogite; Onekaka schist; Ar-Ar dating; Whole Rock Rb-Sr age; K-Ar dating; Paleo-Pacific Ocean; T_<1A> COMPLEX; カンブリア紀オフィオライト; 蛇紋岩メランジ; タスマン海オープニング; 同位体年代

The early two months of this academic year were the season for field work in New Zealand and New Caledonia. Through the field work, we recognized the south-eastern extension of the Lachlan Fold Belt, eastern Australia in the area of the west coast in New Zealand. The extension of the New England Fold Belt, however, was, not positively recognized in New Zealand. Lithologically those of basement in New Caledonia were similar to those of the New England Fold Belt. Even so, Dating study did not support the correlation mentioned above.Ar-Ar and K-Ar dating studies for the Onekaka schist, Nelson, New Zealand were keys to solve Paleozoic metamorphism which was recognized in the New England Fold Belt. The Cretaceous ages (about 100Ma) for the Onekaka schist reveals that the early Paleozoic terrain in New Zealand has suffered only Cretaceous igneous episodes.Ar-Ar dating for the rock in Antarctica also show the same episodes. Whole rock Rb-Sr age study and Eclogite K-Ar age study also show the carboniferous activity in southern New England Fold Belt. Radiolarian study in the Lachlan and other dating studies including U-Pb isotope studies indicate the first subdution and subsequence episodes in Paleo-Pacific Ocean.

本学年的前两个月是新西兰和新喀里多尼亚实地考察的季节。通过实地工作，我们认识到澳大利亚东部拉克兰褶皱带向新西兰西海岸地区的东南延伸。然而，新英格兰褶皱带的延伸并未在新西兰得到积极认可。新喀里多尼亚基底岩性与新英格兰褶皱带相似。尽管如此，测年研究并不支持上述相关性。新西兰尼尔森Onekaka片岩的Ar-Ar和K-Ar测年研究是解决新英格兰褶皱带古生代变质作用的关键。 Onekaka片岩的白垩纪年龄（约100Ma）表明新西兰早古生代地形仅经历过白垩纪火成岩事件。南极洲岩石的Ar-Ar测年也显示出相同的事件。全岩Rb-Sr年龄研究和榴辉岩K-Ar年龄研究也显示了新英格兰褶皱带南部的石炭纪活动。拉克兰的放射虫研究和包括 U-Pb 同位素研究在内的其他测年研究表明，古太平洋发生了第一次俯冲和后续事件。

项目成果

T.WATANABE,E.C.LEITCH,T.ITAYA AND S.FUKUI: "ECLOGITE AND GLAUCOPHANE SCHIST FROM EASTERN AUSTRALIA:EVIDENCE FOR EARLY PALEOZOIC PLATE CONVERGENCE AT EASTERN GONDOWANA MARGIN" TERRA NOVA(Abstract supplement 4). 5. 28 (1993)

T.WATANABE、E.C.LEITCH、T.ITAYA 和 S.Fukui：“来自澳大利亚东部的榴辉岩和蓝铜片岩：冈多瓦纳东部边缘早期古生代板块聚合的证据”TERRA NOVA（摘要补充 4）。

T.Watanabe, E.C.Leitch, T.Itaya and S.Fukui: "Eclogite and Glaucophane Schist from Eastern Australia : Evidence for Early Paleozoic Plate Convergence at Eastern Gondowana Margin" Terra Nova (Abstract Supplement 4). 5. 28 (1993)

T.Watanabe、E.C.Leitch、T.Itaya 和 S.Fukui：“澳大利亚东部的榴辉岩和蓝闪石片岩：冈多瓦纳东部边缘早期古生代板块聚合的证据”Terra Nova（摘要补充 4）。

T.Usuki and T.Watanabe: "Zoned Garned in Eclogite from Eastern Australia" Terra Nova (Abstract Supplement 4). 5. 27 (1993)

T.Usuki 和 T.Watanabe：“来自澳大利亚东部的榴辉岩分区”Terra Nova（摘要补充 4）。

T.Watanabe, M.M.Buslov and S.Koitabashi: VSP International Science Publishers (The Netherland). Reconstruction of the Paleo-Asian Ocean (R.G. Coleman Editor), 160-177 ((In Press))

T.Watanabe、M.M.Buslov 和 S.Koitabashi：VSP 国际科学出版社（荷兰）。

Y,TAKIGAMI: "^<40>Ar-^<39>Ar Geochronological Studies on some Paleomagnetic Samples of East Antarctica" National Institute.Polar Research,Japan. (1993)

Y，TAKIGAMI：“^<40>Ar-^<39>Ar 对东南极洲一些古地磁样本的年代学研究”国家极地研究所，日本。