【摘要】 本文对南岭地区燕山期两类不同成因花岗岩（改造型及同熔型）共5个岩体23个人工重砂样品中磷灰石作了较详细的矿物学工作,包括矿物的物理性质、化学成分、稀土元素地球化学特征、红外吸收光谱以及锶同位素特征等。研究结果表明,所研究的两类不同成因花岗岩中的磷灰石标型特征有较明显区别:改造型花岗岩磷灰石为不够完整的六方柱状晶形,相对密度、硬度、红外光谱吸收带某些特征值及其初始⁸⁷Sr/⁸⁶Sr比值均稍大（强）于同熔型花岗岩的磷灰石;改造型花岗岩的磷灰石中较富含Mn、REE及F,同熔型磷灰石中较富含Cu、Pb和Cl。文中探讨了磷灰石标型特征的控制因素和形成规律,为其母岩的成因、物质来源提供了矿物学标志和信息。更多还原

【Abstract】 Apatites from syntectic granitoids are characterized by their rather perfect crystallization, relative density （3.103—3.141）, microhardness （442—461kg/mm²） and peculiar contents of some elements: Cu 1970—2373 ppm, Pb 292.92--480 ppm, F 25367--38950 ppm, Cl 2417—4798.75 ppm. In contrast, apatites from the transformation granitoids have relative densities 3.142—3.165, microhardness 461—483 kg/mm²,Cu 12.8—23.4 ppm, Pb 260--306 ppm, F 42400--75000 ppm, C1 95—438 ppm, and relatively rich REE. In addition, apatites from the transformation granitoids have somewhat higher infrared spectroscopic data (1050—1046 cm^-1) than those from the syntectic granitoids (1048—1044 cm^-1, 602—601 cm^-1). The initial ⁸⁷Sr/⁸⁶Sr ratio of apatites from syntectic granitoids is 0.70564—0.70566 while that of apatites from the transformation granitoids is 0.72116.From the above discussion, we may reach the conclusion that these two types of granitoids had different source materials and were formed under different physical-chemical conditions, i.e., the magma of the syntectic granitoids came from greater depth while the magma of the transformation granitoids was a kind of remelting magma derived from crustal materials.更多还原