Jialu carbonatites, Luonan County, Shangluo, Shaanxi, Chinai

Regional Level Types
Jialu carbonatites	Complex
Luonan County	County
Shangluo	Prefecture
Shaanxi	Province
China	Country

The Jialu REE deposit consists of Archean to Early Paleoproterozoic basement rocks covered by Proterozoic volcanic and sedimentary sequences. The basal structural layer is the Archean–Paleoproterozoic Taihua Group, overlain by the Mesoproterozoic Xiong’er Group, comprising mainly biotite plagioclase gneiss, granites, plagioclase amphibolite, quartzite, and marble. The Xiong’er Group is represented by the Mesoproterozoic volcanic rocks, such as andesite, dacite, and tuff.
Outcropped strata are the Wujiaping Formation of the Archaean TTG gneiss suite consisting of biotite plagiogneiss and biotite amphibole plagiogneiss. Aegirine–augite syenite and Arfvedsonite syenite are locally distributed. Ore-bearing carbonatite veins are mostly composed of manganese-bearing calcite, with some quartz and K-feldspar. Some ore-bearing carbonatite veins occur as large veins or reticulated veins and locally extend to the Archean biotite–plagio–hornblende gneiss, of which the former is more extensively mineralized. The length of the carbonatite veins is generally ∼ 55–247 m, varying in thickness from 1 to 3 m. The large ore vein (No. G54) reaches 444 m in length and 3–6 m in thickness, with light potassic alteration and silicification.
The length of the carbonatite veins is generally ∼ 55–247 m, varying in thickness from 1 to 3 m. The large ore vein (No. G54) reaches 444 m in length and 3–6 m in thickness, with light potassic alteration and silicification. Stage II is distinguished by standalone minerals such as monazite, xenotime, and bastnäsite. Monazite mainly appears in this stage, mostly as blades and plates with a typical grain size >10 μm.

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References