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一、一般特点及物理性质龙门山拗陷中段是一个很有意义的泥盆纪沉积磷矿的成矿区。在成矿区的西侧,含磷岩系的岩性序列自下而上为:角砾状和致密块状磷块岩、磷铝质岩、黑色页岩和细砂岩。在磷铝质岩中,有时在磷块岩层上部,产有一种沉积岩中罕见的自生矿物——磷锶铝石的合硫和钙的变种。该矿物首先由段前烈、舒銮绶等同志发现,定名为硫磷铝锶矿,并认为与其变种羟硫磷铝锶矿相当。磷铝质岩呈灰色、晤灰色及灰黑色,有时带咖啡色,中厚层至厚层状(照片1),主要组成矿物是磷锶铝石及粘土矿物(以高岭石为主,有少量水云母),此外尚有磷灰石、黄铁矿、有机质,以及陆源碎屑矿物:电气石、锆石、金红石、磁铁矿、钛磁铁矿等。磷铝质岩成似层状或透镜状产出,沿走向方向在该区南北两端相变为硅质岩。
I. GENERAL FEATURES AND PHYSICAL PROPERTIES The middle part of the Longmenshan depression is a significant mineralization area for the Devonian sedimentary phosphate rock. On the west side of the metallogenetic zone, the lithologic sequence of the phosphate-bearing rock series is bottom-up: brecciated and compact massive phosphorite, aplite, black shale and fine sandstone. In aluminous rocks, sometimes in the upper part of the phosphorous block, there is a combination of sulfur and calcium that is a rare authigenic mineral in the sedimentary rocks, phosphorus-strontium aluminate. The mineral was first discovered by Duanqie Lie and Shu Lusong, and other comrades, and was named as parathionite. It was considered as equivalent to the ferro-aluminum-strontium aluminate of its variety. Phlogophites are greyish, gray and gray-black in color, sometimes brownish-brown to medium-thick to thick-lamellae (photo 1). The main minerals are phyllosilicate and clay minerals (mainly kaolinite) Water mica), in addition to apatite, pyrite, organic matter, and terrigenous detrital minerals: tourmaline, zircon, rutile, magnetite, titanium magnetite. Phlogoid rocks resemble layer-like or lenticular-like output and change into silicalite along the strike direction at the north and south ends of the area.