岩象觀察顯示墾丁混同岩體中之換質超基性岩曾經歷強烈剪切作用及不同程度蛇紋石化、碳酸鹽化與矽化作用。這些超基性岩先後與富含二氧化碳及富矽流體反應，呈現序列明顯之微組構及礦物化學轉變，近似隱沒雜岩及逆衝蛇綠岩體所見之里斯文岩化作用（listvenitization）。
墾丁換質超基性岩部份仍保有蛇紋石之橄欖石假晶，並含有浸染狀鉻尖晶石，局部構成鉻鐵尖晶岩。彼等鉻尖晶石之Cr#（即100Cr/(Cr+Al)）為43-59，具有洋脊源深洋橄欖岩特性。部份鉻尖晶石（Cr# = 43-45）並裹有負晶狀岩漿包裹體，這些包裹體大多具有複相、富鈉之特色，包含富鈦高鈉韭閃石、鈉金雲母、硬玉、頑火輝石與含鉻透輝石，另有以鎂橄欖石及含鉻透輝石構成之單相包裹體。晶體形態及晶相生長關係顯示他形鎂橄欖石、頑火輝石及透輝石為岩漿受捕捉前之晶相，半自形富鈦高鈉韭閃石、鈉金雲母和硬玉則於岩漿包裹體中結晶。硬玉及韭閃石於洋脊玄武岩模擬地函（MORB pyrolite）岩漿中的溫壓穩定範圍可約制其結晶條件為2.2-3.0 GPa及950-1200°C。對比於隱沒帶熔體包裹體，墾丁岩漿包裹體顯具高鈦之洋脊特徵，且其所含透輝石成份具大陸地殼型相對富鈉斜輝石之特性。
以上這些新發現顯示墾丁超基性外來岩塊曾經歷以下地體構造條件或作用：（1）地函低度部份熔融發生於70-100公里深度；（2）洋脊或張裂環境；（3）典型增積過程發生之里斯文岩化作用。

Petrographic analysis revealed that highly sheared ultramafic rocks from the Kenting mélange in Hengchun Peninsula, southern Taiwan experienced various degrees of serpentinization, carbonatization, and silicification, and formed progressive mineralogical and microstructural changes involving sequential reactions with high ƒCO2 and silica fluids, typical of listvenitization reported in subduction complexes and obducted ophiolites elsewhere. In addition to characterization of the listvenitization process of the rocks, an attempt to determine the origin of the protolith was made with evidence derived from petrography and mineral chemistry. Fresh chromian spinel crystals found in the rocks and associated chromitite pods had low Cr# (100Cr/(Cr+Al) = 43-59) comparable to those reported for MOR-type abyssal peridotites. Furthermore, some chromian spinel grains (Cr# = 43-45) were found to preserve numerous negative-crystal inclusions with a high Na and Al assemblage of Ti-rich sodic pargasite, aspidolite, jadeite, and enstatite ± diopside. Monomineralic inclusions of forsterite, diopside and enstatite with irregular shapes were identified as well. Constraints from the stability of jadeite, Ti-rich sodic-pargasite, and other liquidus phases indicated a melt trapping process at 950-1200°C and 2.2-3.0 GPa during the growth of chromian spinel. Additional confinements for further modifications of the tectonic genesis of the Kenting ultramafic exotics were suggested to include the following new findings: (1) a very low degree of partial melting of the source rocks occurred at a depth of 70-100 km; (2) the source material was derived from an MOR-type or a rifting environment; (3) large-scale tectonic emplacement and accretion processes were involved as evidenced by the provenance and listvenite-type deformation and metasomatism of the rocks.

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