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• W2355145965 abstract "potassic and sodic mantle alkali-rich magma systems are the integral of all ig-neous rocks that are formed in a short geological period, and include the ultrabasic, basic, inter-mediate and acidic alkali-rich rocks along deep faults. The integral of potassic rocks is namedpotassic mantle alkali-rich magma system, and the integral of sodic rocks is named sodic mantlealkali-rch magma system. The study for Ailaoshan-Jingshajiang potassic alkali-rich igneous rocksbelt show that in intrusion depth, these rocks can be hypogene, hypabyssal and extrusive; inlithology, they can be ultrabasic, basic, intermediate and acidic; and in alkalinity most rocks arealkaline and weakly alkaline. Their striking features are KNa, high potassium and alkali-rich.In petrochemistry, these rocks are generally highly alkaline ( Na_2O + K_2O range from 4.55% to12.5%), potassium-rich (K_2O/Na_2O ratio is 1.15-3.20), with high CaO (2.20% - 14.9%),high Rb, Sr, Ba, Th, U, and low Rb/Sr. The total contents of rare earth elements are higher,the light rare earth elements are strongly enriched, and the δEu values are low. Most Isr valuesrange from 0. 705 to 0. 706. I_(Nd) range from 0. 512305 to 0. 512630. The Sr-Nd-Pb isotopic dataimply that the magma of this rock belt was derived from EM Ⅱ type mantle source, and probablydirectly came from a kind of potassie mantle. The Anning river sodic alkali-rich igneous rock beltare also hypogene, hypabyssal and extrusive in intrusion depth, ultrabasic, basic, intermediateand acidic in lithology and mostly are alkaline and weakly alkaline in alkalinity. Most of sodic al-kali-rich rocks are high in Na_2O + K_2O (5.67% - 14.44% ), sodium-rich (the K_2O/Na_2O ratio is0.22-0.90), with high contents of TiO_2 (0.15% -6.44% ) and large ion lithophile elements.Nb, Ta, Zr and Rb/Sr are relatively higher. The contents of light rare earth elements are lowerthan those of potassic rock belt, but δEu values are higher, and sometimes even positively abnor-mal. I_(sr_ values range from 0. 705 to 0. 706. I_(Nd) value is about 0. 512630. These rocks are similarto the igneous rocks in the rift area derived from mantle. They are mainly derived from mantlemulti-period sodie alkali-rich magma and multi-stage evolved. The study shows that there are notonly potassium-rich mantle source areas, but also sodium-rich mantle source areas. These mantlemagmas were formed in the deep mantle under the high pressure and high temperature conditions.As the passageway of magma uprising, the ultra-deep faults are important for formation of thepotassic and sodic mantle alkali-rich magma systems." @default.
• W2355145965 created "2016-06-24" @default.
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• W2355145965 date "2003-01-01" @default.
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• W2355145965 title "A Humble Opinion on the Potassic and Sodic Two Mantle Alkali-Rich Magma Systems" @default.
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