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Origin of lamprophyres by the mixing of basic and alkaline melts in magma chamber in Beiya area,western Yunnan,China

【摘要】:正Lamprophyres consisting mainly of diopside,phlogopite and K-feldspar formed in the early Tertiary around 60 Ma in the Beiya area and are characterized by low SiO_2±46-50 wt%),Rb(31-45 ppm) and Sr(225-262 ppm),high Al_2O_3,(11.2-13.1 wt.%), CaO(8.0-8.7 wt.%),MgO(11.5-12.1 wt.%),K_2O(4.9-5.5 wt.%),TiO_2(2.9-3.3 wt.%) and REE(174-177 ppm),and compatible elements(e.g.Sc,Cr and Ni) and HSF elements(e.g.Th,U,Zr,Nb,Ta,Ti and Y),and low ~(143)Nd/~(144)Nd 0.512372-0.512536, middle ~(87)Sr/~(86)Sr 0.707322-0.707395,middle ~(206)Pb/~(204)Pb 18.50-18.59,~(207)Pb/~(204)Pb 15.60-15.65 and ~(208)Pb/~(204)Pb 38.75-38.8. These rocks developed peculiar quartz megacrysts with poly-layer reaction zones,melt inclusions,and partial melted K-feldspar and plagioclase inclusions,and plastic shapes.Important features of these rocks include:(1) hybrid composition of elements, (2) abrupt increase of SiO_2 content of the melt,recorded by zoned diopside,(3) development of sanidine and aegirine-augite reaction zones,(4) alkaline melt and partial melted K-feldspar and plagioclase inclusions,(5) deformed quartz inclusions associated with quartz megacrysts,(6) the presence of quartz megacrysts in plastic shape with their parent melts,(7) the occurrence of olivine, high-MgO ilmenite and spinel inclusions within earlier formed diopside,phlogopite and magnetite.Median ~(87)Sr/~(86)Sr values between Tertiary alkaline porphyries in the Beiya area and the western Yunnan and Tertiary basalt in the western Yunnan indicate that the Beiya lamprophyre melts were derivative and resulted from the mixing between basic melts that were related to the partial melting of phenocrysts of spinel iherzolite from a mantle source.The alkaline melts originated from partial melting along the Jinshajiang subduction ductile shear zone at the contact between the buried Palaeo-Tethyan oceanic lithosphere and the upper mantle lithosphere.The alkaline melts are composed of 65%sanidine(Or_(70)Ab_(28)An_2) and 35%SiO_2.The melt mixing occurred in magma chambers in the middle-shallow crust at 8-10 km before the derivative lamprophyre melts intruded into the shallow cover in Beiya area.This mixing of basic and alkaline melts might represent a general process for the formation of lamprophyre in the western Yunnan.

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