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最近,在某地发玥有广大碱性岩分布,包括正長岩、霞石正長石、霓輝石正長岩、黑云母輝石正長岩等。这种碱性杂岩成岩林及岩牆侵入在寒武紀石灰岩中。在碱性岩附近,石灰岩变成大理岩。局部有接触变質帶。寬自数公尺至十余公尺,产生有透輝石、符山石、黑榴子石、黑云母、金云母、綠帘石、褐帘石、锆石、榍石,磷灰石等。黑榴子石和榍石普遍,局部很多。黑榴子石經光譜半定量分析含Nb大于0.3％。局部有霓辉石鉀長石和黑榴子石成互层的条帶状岩石,条帶寬約数毫米,紅部分化学分析有以下成分: Nb_2O_5 0.0612％ ZrO_2 1.61％ TR_2O_3 0.022％沿接触部分常有正長岩脈和黑云母(金云母)化。最有意义的是在本区有分布相当广泛的炭酸鹽岩脈(Carbonatites)。这些岩脈主要侵入在结晶石灰岩中,或沿层理,或切割石灰岩层,厚度一公尺至数公尺,沿走向及傾斜方向延長,尚未查明。岩脈多数沿
Recently, there has been widespread alkaline rock distribution in some places, including syenite, nepheline syenite, niopyrite syenite, biotite pluton syenite and so on. This alkaline complex diagenetic forest and dyke intrusion in the Cambrian limestone. In the vicinity of alkaline rock, limestone into marble. Local exposure to metamorphic belt. Wide from a few meters to more than ten meters, resulting in diopside, Fu Shan, black garnet, biotite, phlogopite, green curtain stone, brown curtain stone, zircon, stone, apatite and so on. Black garnet and stone common, a lot of local. Semi-quantitative analysis of black garnet by spectroscopy with Nb greater than 0.3%. Partially developed kibbled feldspar and kurdite are interlayered strip-like rocks with a strip width of about several millimeters. The chemical analysis of the red part has the following composition: Nb_2O_5 0.0612% ZrO_2 1.61% TR_2O_3 0.022% Regular syenite along the contact Veins and biotite (phlogopite). The most significant is the widespread Carbonatites in this area. These dikes mainly intruded into crystalline limestone, or along the bedding, or cut the limestone layer, the thickness of one meter to several meters, extending along the direction and tilt, has not yet been identified. Dart along most of the dikes