“NON-CALCIFEROUS” ORTHOPYROXENE AND ITS BEARING ON THE PETROGENESIS OF ULTRAMAFIC ROCKS IN SANGUN AND JOETSU ZONES
“NON-CALCIFEROUS” ORTHOPYROXENE AND ITS BEARING ON THE PETROGENESIS OF ULTRAMAFIC ROCKS IN SANGUN AND JOETSU ZONES
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“非钙质”斜方辉石及其对上郡和上越地区超镁岩成岩作用的影响
DOI：
10.2465/ganko1941.69.343
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
S. Arai
中科院分区：
文献类型：
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作者：
S. Arai
三关带及其邻区哈尔兹伯尔质岩可分为两类。一种不含斜辉石，含有极度缺钙（“非钙化”）的正辉石和透闪石。另一种是普通辉石，含有普通钙化的正辉石和少量斜辉石。前者常伴有较年轻的花岗质岩体，主要分布在中央区中部和九州北部。它可以解释为由含斜辉石的强蛇纹石化橄榄岩热变质作用产生的。在日本中部的若越地区，超镁铁质杂岩也被大量花岗质岩石侵入。Chugoku地区中部的超镁铁性杂岩（Arai, 1973a, b）的岩石成因可以直接应用于Joetsu地区。预再结晶阶段的原始岩石可能为薄斜辉石岩层的微晶质橄榄岩。
Harzburgitic rocks in Sangun zone and adjacent areas can be divided into two types. One is free from clinopyroxene and contains extremely Ca-depleted (“non-calciferous”) orthopyroxene and tremolite. The other is ordinary harzburgite, which contains ordinarily calciferous orthopyroxene and small amounts of clinopyroxene. The former is always accompanied with younger granitic masses, and is predominantly distributed in the central part of the Chugoku district and in northern Kyushu. It can be interpreted to have been produced by thermal metamorphism from strongly serpentinized clinopyroxene-bearing peridotites. In Joetsu region, central Japan, ultramafic complexes are also invaded by large amounts of granitic rocks. “Non-calciferous” orthopyroxene is also found, and petrogenesis of ultramafic complexes in the central part of the Chugoku district (Arai, 1973a, b) may be directly applied to those in Joetsu region. Original rocks of pre-recrystallization stage may be wehrlitic peridotites with thin clinopyroxenite layers.