Sinadarin duniya muhimmin memba ne na mabuɗin ƙarfe. Kyautar albarkatun ƙasa da ba kasafai ba na kasar Sin ya fi kyau kuma ya fito ne daga Baiyun Obo, wani yanki mai girma da ba kasafai ba a duniya. Duk da haka, saboda takulallen maƙasudin binciken ma'adanai, ka'idar ma'adinan ƙasa da ba kasafai ba, da fasahar bincike, an sami fahimta daban-daban game da babban tsarin haɓaka ƙarfensa, ilimin halittar jikin tama da yuwuwar albarkatu, waɗanda ke hana ƙima da ingantaccen amfani da albarkatun ƙasa. . Don fayyace hanyar samar da ajiya na Bayan Obo da kuma kimanta yuwuwar albarkatun kasa da ba kasafai ba, Cibiyar Nazarin Geology da Geophysics na Kwalejin Kimiyya ta kasar Sin ta tura manyan ayyuka tare da hadin gwiwar Baotou Iron and Steel Co., Ltd. . da bincike na metallogenic a Bayan Obo. Ta hanyar binciken hadin gwiwa na ilimin geology, geochemistry, geophysics da sauran fannoni, tsarin juyin halitta na Bayan Obo carbonatite magma da tsarin wadatar duniya da ba kasafai aka bayyana ba, an fayyace hanyar sanya carbonatite da abubuwan sarrafa tama, uku- An gina siffa mai girma na jikin ƙasa mai ɗauke da tama, kuma an sake tantance albarkatun ƙasa da ba kasafai ba. (1) Yankin Baiyunebo ya fuskanci motsin tectonic da yawa. Kafin emplacement na carbonate duwatsu, farkon-tsakiyar Proterozoic sedimentary duwatsu (Baiyunebo kungiyar quartz sandstone, conglomerate, slate, da dai sauransu) a cikin ma'adinai yankin sun sha yankin compressional tectonic mataki, da kuma kwance strata da aka maye gurbinsu da Tsarin don samar da tsakuwa. tsarin cake, mylonite, ninka, da sauransu. Sabuwar kafa ta kusan EW trending da m tectonic schistosity yana ba da hanyar da ta dace don haɓaka magma carbonated na ~ 1.3 biliyan shekaru (Fig. 1). Rarraba, alaƙa da alaƙar da ke tsakanin farkon da kuma ƙarshen tsaunukan tsaunuka na Ƙungiyar Proterozoic Bayunebo ta Tsakiya a cikin yankin ma'adinai na buƙatar sake yin nazari.
Hoto 1 Tarihin haɓakawa da haɓakar carbonatite na Mesoproterozoic Basin Bayan Obo
(2) Bayunebo H8 dolomite dutsen carbonate ne mai ƙyalli, wanda ke da alaƙar kutsawa a fili tare da dutsen da ke kewaye. Dutsen Carbonate shine mahaifan dutsen da ba kasafai ake samun ma'adinan ƙasa ba da kuma jikin tama mai ƙarancin ƙasa. Tarin manyan karafa a Bayan Obo ya faru ne cikin shekaru biliyan 1.3. Carbonic magma yana da yanayin juyin halitta daga baƙin ƙarfe-magnesium-calcareous, da ƙananan abubuwa na ƙasa a cikin duwatsun carbonate a matakai daban-daban, musamman abubuwan da ba kasafai masu haske ba, suna nuna yanayin haɓakawa a hankali. Bayan samuwar ajiya, ya sami sauye-sauye guda biyu a cikin Farkon Paleozoic (shekaru 450 ~ 400) da Late Paleozoic (shekaru 280 ~ 260) bi da bi. Tsarin sauye-sauye ya haifar da kunna ƙasa mai wuyar gaske da kuma samar da sabbin ma'adanai, amma babu wani ƙari a fili na ƙasashen waje da ba kasafai ba.
(3) Rarraba duwatsun carbonate da aka bayyana daga sakamakon juzu'i na abubuwan da ba a iya gani ba suna da halayen asali na rarraba gabas-yamma. Babban ma'adinai da tama na gabas sune manyan wuraren rarraba jiki na maganadisu. Babban ma'adinai da tama na gabas suna da alaƙa da wuraren rarraba dutsen carbonate, kuma zurfin ci gaban dutsen carbonate yana da girma. Babban Magnetic anomaly jiki da low resistivity anomaly jiki bayyana uku-girma rarraba carbonate dutsen (ore jiki) (Fig. 2). Carbonatite a Bayan Obo yana da cibiyar haɓakawa kuma yana jin daɗin tashar magma iri ɗaya a cikin zurfin ɓangaren. Cibiyar tana tsakanin babban ma'adanin da tama na gabas. Bayan emplacement na carbonated magma, m foliation kafa ta maye gurbin farkon tsarin aka tura zuwa yamma (yamma mine) da kuma zuwa gabas (Huahua) bi da bi, da bifurcation da merging na iya faruwa (Fig. 3).
Hoto 3 Samfurin rarraba sararin samaniya na carbonatite a cikin ajiya na Baiyunebo
(4) Baiyunebo carbonatite yana da girma mai girma da babban matakin juyin halitta, wanda shine mabuɗin don tarin tarin ƙasa da ba kasafai ba. Dangane da kewayon rarraba da aka samu, ƙarar da (mafi ƙarancin) ƙarancin dutsen carbonate (rare ƙasa tama jiki), da kuma amfani da 2% ƙarancin ƙasa abun ciki na dukan dutsen carbonate dutsen (dangane da matsakaicin matsakaicin ƙimar da aka samu daga bayanan. A cikin shekarun da suka gabata), an yi kiyasin cewa yuwuwar albarkatun ƙasa mai ɗorewa a yankin da ake haƙar ma'adinai na Baiyunebo ya kai tan miliyan 333, wanda ya kusan sau 10 fiye da ƙimar da aka sani yanzu na miliyan 36. ton a Bayunebo, Sabbin fitar da jimillar albarkatu na duniya da aka tabbatar da ƙarancin albarkatun ƙasa (ciki har da Bayan Obo) na Cibiyar Nazarin Yanayin ƙasa ta Amurka ya kai 2.78 na tan miliyan 120.
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Lokacin aikawa: Maris-02-2023