大陸鹼性玄武岩內含高壓相斜輝石偉晶，其成分變化是岩漿在深處演化最好的記錄器，本研究藉由澎湖群島煙墩山、查坡島及望安的斜輝石偉晶，分析其主要元素及微量元素含量與Sr與Nd同位素比值，進而探討澎湖地區玄武質岩漿的演化過程。Ca、Fe、Al、Ti、Na在斜輝石，隨著Mg、Si的降低而增加，符合pMELTS程式模擬結果，因而斜輝石偉晶為鹼性玄武質岩漿在等壓降溫下的結晶顆粒，望安斜輝石偉晶高Al、高Na的特徵代表結晶分化後期的產物。經Putirka之斜輝石飽和溫壓計算，鹼性玄武岩成分在9 kbar才結晶出斜輝石，與此區域莫荷面之深度符合(～30 km)。

　　Sr、Nd同位素分析結果顯示斜輝石與圍岩同源，但圍岩為母岩漿及未分化原始岩漿的混合體，可由REE之分配係數、Fe-Mg平衡常數等結果確認。較低的Nd同位素比值與LILE及Nb、Ta的富集表示HIMU可能為隱沒之古老海洋地殼物質，經過小比例部份熔融形成，此訊號出現在斜輝石之邊緣與長石之核部。

　　以pMELTS程式、熱平衡方程式、偉晶成分變化可計算偉晶之結晶速率約為10-8 cm/sec，數十立方公分的偉晶約在100～1年內形成，而岩漿庫結晶分化與裂隙再活化的時間尺度類似，約102年。斜輝石偉晶的形成可能與底侵作用（underplating）及裂隙再活化有關，暗示地殼的應力演化可控制岩漿結晶分化的程度。斜輝石偉晶或斑晶之地球化學研究有助於探討板內玄武岩（Intraplate basalt）或大型火成岩域（LIP）在莫荷面的演化形式與條件。

　　Compositional variations of clinopyroxene megacrysts occurred in continental alkali basalts provide constraints on magma evolutions in deep interior of the earth. In this study, clinopyroxene megacrysts sampled from Penghu islands in Taiwan Strait were analyzed for major and trace element concentration as well as Sr and Nd isotopic ratios to investigate the evolution history of the basaltic magma forming Penghu islands. The Mg and Si contents of the analyzed megacrysts decrease with increasing Ca, Fe, Al, Ti and Na contents, consistent with the results modeled from pMELTS, indicating that these clinopyroxene megacrysts were formed by isobaric crystallization. Samples from Wang-an island contain high Al and Nd concentrations representing products of late-stage crystallization. Based on the thermobarometer of Putirka et al. (1996), alkali basalts will not crystallize clinopyroxene until 9 kbar, consistent with the depth of Moho in the sampling locality.

　　The Sr and Nd isotopic compositions of the clinopyroxene megacrysts and their host lavas indicate derivation from a common source. However, the REE partitioning coefficients and Fe-Mg exchange coefficient further indicate that megacrysts and their host lavas were not in chemical equilibrium. The low 143Nd/144Nd isotopic ratios accompanied by enrichments in LILE, Nb and Ta occurring in the rims of the analyzed clinopyroxene megacrysts and the cores of the analyzed plagioclase megacrysts might reflect the results of small degrees of partial melting from recycled oceanic materials.

　　The crystal grow rate of clinopyroxene megacrysts, calculated on the basis of heat balance, pMELTS and correlation between mineral volumes and crystal temperature, is in the order of 10-8 cm/sec. The time scale of megacryst grow is about 100~1 years, comparable to that required for high degree crystal fractionation and hydraulic fracture reactivation (~102 years), implying crustal stress might control the extent of crystal fractionation. The results from this study confirm that the geochemical features of clinopyroxene megacrysts and phenocrysts can reveal the evolution history of intraplate basalts.

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