RETROLOGICAL STUDY OF THE BILIBILI ALKALI LAYERED INTRUSION

哔哩哔哩碱层状入侵的追溯研究

• 批准号: 09640574
• 负责人: NISHIYAMA Tadao
• 金额: $ 1.92万
• 依托单位: KUMAMOTO UNIVERSITY (1998)Kyushu University (1997)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640574/
• 关键词: IGNEOUS LAYERING; THE SPACING LAW; MAGMA; CHEMICAL DIFFERENTIATION; SOLIDIFICATION; HEAT FLOW; 火成層状構造; アルカリ岩; リ-ゼガングリング; ソーレー効果; マグマ対流

This project carried out the investigation of the occurrence of the BiliBili alkali layered intrusion in the south of Sulawesi island, Indonesia, and examines the origin of the layered structures, leading to the following conclusions.(1) There are 197 layers within 120 meters from the contact between the intrusion and the surrounding Chamba Formation of the Miocene. The thickness of the layer increases systematically towards the interior of the intrusion. The systematics obeys the Spacing Law similar to that of the Liesegang Rings.(2) A layer consists of a hard part rich in Na2O and a soft part rich in K20.(3) Overall chemical variation of the intrusion based on the bulk rock chemistries of randomlly collected 24 samples is almost similar to that within a single layer. Thus chemical differentiation occurred during the layer formation by solidification of a homogeneous magma.(4) A physical model is proposed for the layer formation such that the layer represent a eutectic mushy layer where the interplay of the layer front (high temperature side of the layer) and the solidification front (low temperature side) casuses a periodical growth and solidification of the layer. Chemical differentiation within a layer was caused by mass transfer associated with heat transfer. The Spacing Law can be explained by the growth of solidified part which prevents an efficient heat loss from the intrusion that influences the thickness of the layer.

该项目对印度尼西亚苏拉威西岛南部的比利比利碱层次的侵入进行了调查，并检查了分层结构的起源，从而得出了以下结论。（1）在入侵和周围的chamba chamba secoration of Chamba semocene的接触中，有197米以内的197米层。该层的厚度系统地朝着入侵的内部增加。该系统遵守与Liesegang环相似的间距定律。（2）一层由富含Na2O的硬部分和富含K20的软零件组成。（3）基于随机收集到的24个样品的整体岩石化学的整体化学变化，几乎与单层相似。因此，在层形成过程中通过固化均匀的岩浆发生化学分化。（4）提出了对层形成的物理模型，以使层代表层的糊状层，其中层前面的相互作用（层的高温侧）和固体侧面（低温侧）casuses casuses casuses层的定期生长和层的固体化。层内的化学分化是由与传热相关的传质引起的。可以通过固化部分的生长来解释间距定律，从而防止影响层厚度的侵入中有效的热量损失。

项目成果

T.Nishiyama: "Kinetic modelity of the coesite-quantb fransition in an elastic field and its inplication for the exhumetion of ultra-high pressure metamophic" The Island Are. 7. 70-81 (1998)

T.Nishiyama：“弹性场中柯石英-量子转变的动力学模型及其对超高压变质体挖掘的启示”The Island Are。

T.Nishiyama: "Diffusion in garnet and the time scale of metamorphism. (in Japanese)" Journal of Geography. (in press).

T.Nishiyama：“石榴石中的扩散和变质作用的时间尺度。（日语）”地理杂志。

西山,忠男: "ザクロ石中の拡散と変成作用の時間スケール" 地学雑誌. 印刷中. (1999)

Nishiyama，Tadao：“石榴石扩散和变质作用的时间尺度”，地质杂志，1999 年出版。

T.Nishiyama: "Uphill diffusion and a new nonlinear diffusion equation in ternary non-electrolyte system." Phisics Earth Planet.Interiors. 107. 33-51 (1998)

T.Nishiyama：“三元非电解质体系中的上坡扩散和新的非线性扩散方程。”

T.Nishiyama: "Kinetic modeling of the coesite-quartz transition in an elastic field and its implication for the exhumation of ultrahigh-pressure metamorphic rocks." The Island Arc. 7. 70-81 (1998)

T.Nishiyama：“弹性场中柯石英-石英转变的动力学模型及其对超高压变质岩折返的意义。”