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首页> 外文期刊>Contributions to Mineralogy and Petrology >Petrogenesis and structural petrology of high-pressure metabasalt pods, Sivrihisar, Turkey
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Petrogenesis and structural petrology of high-pressure metabasalt pods, Sivrihisar, Turkey

机译：高压次生玄武岩豆荚的成因与结构岩石学，土耳其Sivrihisar

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摘要

Lawsonite eclogite pods ranging in size from 3 cm to 6 m occur in lawsonite blueschist and eclogite facies metasedimentary and metabasaltic rocks in the Siv-rihisar Massif, Turkey. Some pods have a core of lawsonite eclogite surrounded by alternating, centimeter-scale layers of lawsonite blueschist, eclogite, and transitional eclogite-blueschist, all with similar basaltic bulk composition. These pods also contain texturally late lawsonite-rich veins and layers. Most eclogites and blueschists within the pods lack reaction textures, but some blueschists near pod margins contain texturally complex garnet as well as glaucophane rims on omphacite, suggesting retrogression of eclogite to blueschist. Phase diagrams (pseudosections) calculated for the lawsonite eclogite core of a meter-scale pod indicate that the eclogite equilibrated at approx 22-24 kbar, approx 520 deg C. Lawsonite eclogite and blueschist at the tectonized margin of the same pod equilibrated at similar temperatures and slightly lower pressures. The composite eclogite-blueschist pod is foliated, lineated, and folded. An earlier generation of lineated omphacite in the pod core has a different spatial orientation than the lineation at the pod margin, although electron backscattered diffraction data show that core and rim omphacite have similar lattice preferred orientation patterns. Petrologic and structural data are consistent with mechanical formation of pods by folding and dissection of eclogite layers at high-P, and localized retrogression at pod margins during initial stages of exhumation at P-T condi-tions >425 deg C, 16 kbar.
机译：土耳其西夫-里希萨尔地块的钠钙榴辉岩蓝云岩和榴辉岩相的准沉积和准玄武岩中都出现了钠钙榴石榴辉岩豆荚，大小在3 cm至6 m之间。一些豆荚的钙钠榴石榴辉岩的核心被交替的厘米级层的钙钠榴石蓝辉石，榴辉岩和过渡榴辉岩-蓝辉岩包围，所有这些基底都具有类似的玄武岩块体组成。这些豆荚还包含质地较晚的富含钠钙钠石的脉和层。豆荚内的大多数榴辉岩和蓝辉岩缺乏反应纹理，但豆荚边缘附近的一些蓝辉岩含有质地复杂的石榴石以及绿辉石上的葡甲环，说明榴辉岩向蓝辉岩逆行。计算出的米级泡荚岩榴辉岩榴辉岩岩心的相图（伪截面）表明，该榴辉岩在约22-24 kbar（约520摄氏度）下达到平衡。在相同温度下，同一荚果的构造边缘上的钙钠榴石榴辉岩和蓝胶岩平衡。和稍低的压力。复合的榴辉岩-blueschist荚被叶化，衬里和折叠。荚果芯中较早一代的线状绿沸石具有与荚果边缘处的线型不同的空间取向，尽管电子背散射衍射数据显示核和边缘辉绿岩具有相似的晶格优先取向模式。岩石学和结构数据与在高P条件下折叠和解剖榴辉岩层形成的荚果的机械形成以及在P-T条件> 425摄氏度，16 kbar的发掘初期阶段荚果边缘的局部倒退相一致。

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