信阳球粒陨石初步研究

1977年12月1日18时57分(北京时间),在河南信阳县肖王公社陨落了一次陨石。这是我国目击陨落并保存的又一次大的石陨石。收集到的两块,其中1号重48公斤,2号重27.5公斤。它们陨落的地理坐标分别为:1号东经114°19′22″,北纬32°19′38″;2号东经114°18′12″,北纬32°20′31″。1号陨石坑口椭圆形,长轴方向280°。长轴长约70厘米,短轴约50厘米,坑深约48厘米。在坑口西边几米处,同时获得两小块陨石碎屑。2号陨石坑保存完好,坑口亦椭圆形,长轴方向260°。长轴长53厘米,短轴32厘米,坑深37厘米左右,东浅西深。落地擦痕不明显,坑口东壁倾角53°,陨落角较陡。

PRELIMINARY STUDY ON THE XIN YANG CHONDRITE

At about 18:57 hr (Beijing time) on December 1st, 1977, some stony meteorites fell in Xiao Wang Commune, Xin Yang County, Henan Province. The two collected (No. 1 and No. 2) are located respectively at 114°19′22″E, ψ + 32°19′38″N; and λ 114°18′12″ E, ψ + 32°21’31″N, weighing 48kg (No. 1) and 27.5kg (No. 2). Their surfaces are covered with a brownish black regmalypt and characterized by well-developed rhyolitic texture, and absence of pneumatogenic depression. Their mineral composition consists mainly of olivine, bronzite, with accessory minerals such as kamacite, troilite, plagioclase, chromite etc. These meteorites clearly are of chondmlitie structure. From the preliminary study on the mineral composition it is suggested that the Xin Yang meteorite may belong to the ordinary H-group chondrite or named as olivine-bronzite chondrite (H6).