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- W2376113145 abstract "Volcanic carbonatites are very rare igneous rocks in the earth surface, which close paragenesis with nephelinite, melilitic rocks always outcroped continental rifting area. A lot of Cenozoic volcanic carbonatites in Baihe area of Lixian county, Gansu province outcroped in Cenozoic kamafugite. The carbonatite cantain these rock types of lapilli, tuff and ignimbrite, lava and ball etc. The carbonatites composed by calcites and rare clinopyroxene, nepheline, apatite and phlogopite in mineralogy, and belong to a sovite according to Le Maitre's A Classification of Igneous Rocks and Glossary of Terms. The whole rock chemical composition of carbonatite has a characteristics rich in CaO, but pool in alkaline( Na2O + K2O), and is very like to high-Ca, low-alkali carbonatite from Fort Portal area, Uganda. However, the major element chemistry of each type of carbonatite is different, such as content of SiO2 is decreasing gradually from black lapilli to ball to ignimbrite/tuff to lava to the carbonatite filled in vesicles. The content of TiO2 , A12 O3, FeO and Fe2O3 , MgO in these rocks have a positive correlation with content of SiO2 , but only CaO in the rocks has a negative correlation with SiO2. The carbonatites have a LREE-rich pattern in the figure of chondrite-normalized REE-pattern, but the abundance of LREE, ΣREE and rare earth elememts(especialy Sr, Ba) in the rocks have a positive correlation with SiO2 like to major elements of the rocks. Carbon and oxygen isotopic compositions of whole-rock samples of the carbonatite lie within ranges of - 9. 58 to 0. 71 for δ13C and 12. 59 to 20. 58 for δ18O. These δ13C and δ18 O values of the carbonatite support the conclusion that the carbonatite was products of magmatism and origined from the mantle. However, the isotopic composition of some carbonatite was changed by secondary isotopic exchange. Exposure to alteration under atmospheric conditions and weathering at the surface produced higher δ18 O and δ13 C values distinct from primary carbonatite. The researchs show that the carbonatites and high potassic volcanic rocks in this area are not a magmatic products of continental rifting, its origin and genesis may be related to uplifting of asthenosphere. The discovery of the WQL carbonatite provide a new petrological evidence to understand chemical composition and characteristics of the WQL mantle." @default.
- W2376113145 created "2016-06-24" @default.
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- W2376113145 date "2003-01-01" @default.
- W2376113145 modified "2023-10-03" @default.
- W2376113145 title "Discovery and significance of Cenozoic volcanic carbonatite in Lixian, Gansu province." @default.
- W2376113145 hasPublicationYear "2003" @default.
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