Elucidation of factors controlling spatial geochemical variation of Cretaceous igneous rocks in SW Japan and verification of the ridge subduction.
日本西南部白垩系火成岩空间地球化学变化控制因素的阐明及山脊俯冲验证。
基本信息
- 批准号:11640451
- 负责人:
- 金额:$ 2.56万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Aims of this project are to elucidate the factors controlling spatial geochemical variation of the Cretaceous igneous rocks in SW Japan and to clarify relationship between this voluminous magmatism and ridge subduction at the eastern Eurasian continent during the Cretaceous. Geological and petrochemical studies have been carried out for early to middle Cretaceous igneous rocks in the San'yo Belt and also for some igneous rocks with unknown ages in the San'in Belt. The igneous rocks with ages ranging from 100 to 120 Ma in the San'yo belt have different geochemical and initial Sr and Nd isotope ratios from igneous rocks with younger ages in the same region. Some older igneous rocks in the San'yo Belt are characterized by high Sr and low Y contents, and also by lower initial Sr and higher initial Nd isotope ratios than the younger igneous rocks in the same region. These geochemical characteristics of the older igneous rocks are similar to the Archean high-Al TTD and Cenozoic adakite, indicating that the magmas were derived by partial melting of the subducted oceanic lithosphare. Those igneous rocks, however, are relatively enriched in Sr and Nd isotope ration, compared with MORB.Then, the magma derived from the subducted slab may have been contaminated with the overlying crustal materials. As these adakitic igneous rocks are frequently recognized in areas, where ridges was subducting, it is strongly suggested that the Kula-Pacific ridge was subducted beneath the eastern margin of the Eurasian continent during the Cretaceous.
本项目的目的是阐明控制日本西南部白垩纪火成岩空间地球化学变化的因素,并阐明白垩纪期间欧亚大陆东部大量岩浆活动与洋脊俯冲之间的关系。对山阳带早白垩世至中白垩世火成岩和山阴带一些年龄不详的火成岩进行了地质和岩石化学研究。山阳带中年龄在100 ~ 120 Ma之间的岩浆岩,其地球化学特征和Sr、Nd初始同位素比值与同地区较年轻的岩浆岩不同。与同地区的年轻岩浆岩相比,山阳带中一些较老的岩浆岩具有高Sr、低Y的特征,并且具有较低的初始Sr和较高的初始Nd同位素比值。这些地球化学特征与太古代高铝TTD和新生代埃达克岩相似,表明岩浆来源于俯冲洋壳岩石圈的部分熔融。而这些岩浆岩的Sr、Nd同位素比值相对富集,说明岩浆来源于俯冲板片,可能受到上覆地壳物质的混染。由于这些埃达克质火成岩经常在洋脊俯冲的地区被识别,因此强烈建议库拉-太平洋洋脊在白垩纪期间俯冲到欧亚大陆东缘之下。
项目成果
期刊论文数量(33)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Akasaka, M., Zheng, Y.and Suzuki, Y.: "maximum strontium content of piemontite formed by hydrothermal synthesis."Jour.Miner.Petrol.Sci.. 95. 84-94 (2000)
Akasaka, M.、Zheng, Y. 和 Suzuki, Y.:“通过水热合成形成的皮蒙特矿的最大锶含量。”Jour.Miner.Petrol.Sci.. 95. 84-94 (2000)
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- 影响因子:0
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Akasaka,M.: "Maximum strontium content of piemontite formed by hydrothermal aynthesis"Journal of Mineralogical and Petrological Sciences. 95. 84-94 (2000)
Akasaka,M.:“热液合成形成的皮蒙特岩的最大锶含量”矿物学和岩石科学杂志。
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加々美寛雄: "本州弧白亜紀〜古第三紀火成活動の時空変遷と下部地殻-Rb-Sr全岩アイソクロン年代とSr,Nd同位体初生値からの検討-"地質学論集. 53. 1-19 (1999)
Hiroo Kagami:“本州岛弧白垩纪到古近纪岩浆作用和下地壳的时空变化 - 从 Rb-Sr 全岩等时线年龄和 Sr、Nd 同位素的主要值进行检验 -”地质杂志 53. 1 -19( 1999)
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木村佳央: "EPMAによるFe^<2+>/Fe^<3+>およびMn^<2+>/Mn^<3+>比の見積り"鉱物学雑誌. 28・4. 159-166 (1999)
Yoshio Kimura:“EPMA 的 Fe^<2+>/Fe^<3+> 和 Mn^<2+>/Mn^<3+> 比率估算”矿物学杂志 28・4 (1999)。
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Tadesse,T.: "Sm-Nd, Rb-Sr and Th-U-Pb zircon ages of syn-and post-tectonic granitoids from the Axum area of northern Ethiopia"Journal of African Earth Sciences. 30・2. 313-327 (2000)
Tadesse, T.:“埃塞俄比亚北部阿克苏姆地区同构造和后构造花岗岩的 Sm-Nd、Rb-Sr 和 Th-U-Pb 锆石年龄”《非洲地球科学杂志》30・2。 -327 (2000)
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IIZUMI Shigeru其他文献
IIZUMI Shigeru的其他文献
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{{ truncateString('IIZUMI Shigeru', 18)}}的其他基金
Geochemical and geochronological examination on Mesozoic continental lithosphere beneath SW Japan
日本西南部中生代大陆岩石圈的地球化学和年代学检查
- 批准号:
14540425 - 财政年份:2002
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Geochemical evolution of thelower crust and upper mantle beneath SW Japan.
日本西南部下地壳和上地幔的地球化学演化。
- 批准号:
09640545 - 财政年份:1997
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Geologic correlation of Southwest Japan and Korean Peninsula
日本西南部与朝鲜半岛的地质对比
- 批准号:
07045015 - 财政年份:1995
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for international Scientific Research
Geochemical evolution of lower crust in relation to formaiton of a marginal sea -An approach based on geochemistry of igneous rocks and their enclaves.
与边缘海形成相关的下地壳地球化学演化——一种基于火成岩及其飞地地球化学的方法。
- 批准号:
06452094 - 财政年份:1994
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Petrological and geochemical study lower crustal materials beneath the lnner Zone of Southwest Japan Arc.
岩石学和地球化学研究西南日本弧内带下的下地壳物质。
- 批准号:
03452070 - 财政年份:1991
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
Geological correlation of southwest Japan and Korean Peninsula-tectonics for spreading of active continental margin-.
日本西南部与朝鲜半岛的地质对比-活动大陆边缘扩张的构造-。
- 批准号:
02045023 - 财政年份:1990
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for international Scientific Research
Petrogenetic study on granitoids based on Sr,Nd and Pb isotopes.
基于Sr、Nd、Pb同位素的花岗岩岩石成因研究。
- 批准号:
63540609 - 财政年份:1988
- 资助金额:
$ 2.56万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)