Origin of MORB deduced from the deep-seated rocks from the ocean floor
Origin of MORB deduced from the deep-seated rocks from the ocean floor
批准号:
10440152
负责人:
ARAI Shoji
金额:
$8.64万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B).
财政年份:
1998
资助国家:
日本
项目状态:
已结题
起止时间:
1998 至 2000
中文摘要
1.超镁铁质岩石从赫斯深,EPR,并从开曼海槽,加勒比海,岩石学检查,他们的差异,如果有的话,取决于扩展速度。地幔橄榄岩为黑橄榄岩(赫斯深部)或二辉橄榄岩(MCT),但纯橄榄岩-橄榄岩在两者之间仅略有不同。这种差异是一致的原始MORB组成的变化,只有轻微依赖于扩展速率。因此,纯橄榄岩-橄榄岩可能与原生MORB处于平衡状态。纯橄榄岩-橄榄岩和MORB都是高压MORB与地幔最上部橄榄岩反应的产物。阿曼蛇绿岩中的地幔橄榄岩,可能形成于快速扩张的山脊,和Luppers橄榄岩,可能形成于一个缓慢扩张的山脊与洋底橄榄岩进行了比较。阿曼蛇绿岩的地幔部分以辉绿帘石为主,与赫斯深海的辉绿帘石相似。在地幔剖面的深部发现了含Cpx的方辉橄榄岩和二辉橄榄岩,可以详细讨论快速扩张的脊下的熔融过程。绿辉橄榄岩主要为二辉橄榄岩至辉橄榄岩,含整合纯橄榄岩,含尖晶石,Cr#为0.3.3。通过对亚特兰蒂斯岸地幔橄榄岩SWIR的研究,了解了超慢速扩张脊下的熔融过程。在Atlantis II FZ的一个斜坡上,证实了从二辉橄榄岩到辉橄榄岩的向上岩性变化,这可以给我们提供洋脊下地幔熔融的空间和温度原因的约束。
英文摘要
1. Ultramafic rocks obtained from Hess Deep, EPR, and from Mid-Cayman Trough, the Caribbean, were petrologically examined to their difference, if any, depending on the spreading rate. The mantle peridotite is harzburgite (Hess Deep) or lherzolite (MCT), but the dunite-troctolite are only slightly different between the two. This difference is concordant with the primitive MORB compositional variation that is only slightly dependent on spreading rate. The dunite-troctolite are, thus, possibly in equilibrium with the primary MORB.Both the dunite-troctolite and MORB are the product of reaction between high-pressure MORB and peridotite at the uppermost mantle.2. The mantle peridoitites in the Oman ophiolite, possibly formed at a fast-spreading ridge, and the Lizard peridotite, possibly formed at a slow-spreading ridge were compared with the ocean-floor peridotites. The mantle section of the Oman ophiolite is dominated by harzburgite similar to that from Hess Deep. Cpx-bearing harzburgite and lherzolite were found in deeper parts of the mantle section, and the melting process beneath a fast-spreading ridge can be discussed in detail. The Lizard peridotite is dominantly lherzolite to harzburgite with concordant dunite which has spinel with Cr# of 0.3.3. The mantle peridotite from the Atlantis Bank, SWIR, was examined to know the melting process beneath a ultra-slow spreading ridge. An upward lithological variation from lherzolite to harzburgite on a slope of the Atlantis II FZ was confirmed, which can give us constraints on the space and temperature legime of mantle melting beneath the ridge.
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田村明弘,牧田宗明,荒井章司: "北海道、神居古潭のがんらん者の成因"地質学論集. 52. 53-68 (1999)
Akihiro Tamura、Muneaki Makita、Shoji Arai:“北海道 Kamuikotan 顽固人民的起源”地质评论 52. 53-68 (1999)。
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Arai, S., Prichard, H.M., Matsumoto, I., and Fisher, P.C: "Potarite (Pd-Hg) in thermally metamosphosed dunite from the Inazumi-yama ultramafic complex, southwestern Japan : an implication for the behavior of mercury in PGE mineralization in peridotite."Mi
Arai, S.、Prichard, H.M.、Matsumoto, I. 和 Fisher, P.C:“日本西南部 Inazumi-yama 超镁铁杂岩热变质纯铜岩中的钾长石 (Pd-Hg):对 PGE 中汞行为的暗示
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共 33 条
Petrological processes of Moho formation
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批准号:20244085
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项目类别:Grant-in-Aid for Scientific Research (A)
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资助金额:$30.12万
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财政年份:2008
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负责人:ARAI Shoji
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依托单位:
Oversea Research on the Bou-Azzer Ophiolite (Morocco) of Proterozoic Age
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批准号:16403010
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$8.32万
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财政年份:2004
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负责人:ARAI Shoji
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依托单位:
An integrated genefical model and exploration/evaluation system for chromittite and platinum-group element ores
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批准号:13554017
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$3.52万
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财政年份:2001
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负责人:ARAI Shoji
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依托单位:
Formation and modification of the mantle wedge : from the ocean to the confinent
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批准号:13440161
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$5.18万
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财政年份:2001
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负责人:ARAI Shoji
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依托单位:
Generation and reorganization of Oman oceanic crust-mantle
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批准号:11691121
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项目类别:Grant-in-Aid for Scientific Research (A).
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资助金额:$12.8万
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财政年份:1999
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负责人:ARAI Shoji
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依托单位:
Magma/mantle interaction and genesis of primitive magnas
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批准号:07454131
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$3.71万
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财政年份:1995
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负责人:ARAI Shoji
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依托单位:
Basic Study for a Catalogue of Upper Mantle Xenoliths in the Japan Island Arcs
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批准号:02640626
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项目类别:Grant-in-Aid for General Scientific Research (C)
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资助金额:$1.41万
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财政年份:1990
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负责人:ARAI Shoji
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依托单位:
海外基金