leucite-tephrite
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Basanite and tephrite from Mt. Crater, Cape Bird and Bonney Lake exhibit similar composition in major elements and trace elements, rare earth elements . They are enriched in MgO, TiO〓, transitional elements and compatible elements , and depleted in SiO〓, Al〓O〓, Na〓O, K〓O, incompatible elements and rare earth elements; Latite from Cape Rodeys and Cape Evens are different from basanite and tephrite, they are enriched in SiO〓, Al〓O〓, Na〓O, K〓O, incompatible elements and rare earth elements, and depleted in Mgo, TiO〓, transitional elements and compatible elements. Volcanic rocks in five regions have the same isotopic ratio of 〓Sr/〓Sr (0.703115-0.703334) and 〓Nd/〓 Nd (0.512892-0.513076), however,〓Pb/〓Pb ratio in volanic rocks from Mt. Crater, Cape Bird and Bonney Lake is lower than those of Cape Rodeys and Cape Evens.
在主元素氧化物和微量元素、稀土元素含量上,克雷克特山、鸟角和博尼湖南岸的碧玄岩、碱玄岩成分比较类似,均具有较高的MgO、TiO〓、过渡元素和相容元素,较低的SiO〓、Al〓O〓、K〓O、Na〓O、不相容元素和稀土元素;罗德角和伊万思角安粗岩雷同,它们具有较高的SiO〓、Al〓O〓、Na〓O、K〓O、稀土元素和不相容元素,较低的MgO、TiO〓、过渡元素和相容元素,但五地区火山岩几乎具有一致的Sr、Nd同位素比值,〓Sr/〓Sr=0.703115-0.703344、〓Nd/〓Nd=0.512892-0.513076,在Pb同位素比值上,五地区的〓Pb/〓Pb=18.664-19.913,其中碧玄岩和碱玄岩比安粗岩的比值稍低。
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The first type, kamafugite, is plagioclasefree, consisted of Tirich phlogopite, melilite, leucite and nephelite. They have lower contents of SiO2 and Al2O3, but have high TiO2, CaO, MgO contents and K/Na and Mg# ratio whereas the second type, potassic trachybasalt, is abundant in plagioclase and contains no phlogopite, melilite, leucite and nephelite. They have higher SiO2, Al2O3,(Na2O+K2O), and lower TiO2, CaO, MgO, and K/Na and Mg#, in comparision to the first type of rocks.
钾霞橄黄长岩是一种不含斜长石,但普遍含有高钛金云母、黄长石、白榴石、霞石的岩石,全岩化学成分具低SiO2和Al2O3,富TiO2、CaO、MgO和高K/Na、高Mg#值的特征;钾质粗面玄武岩含有大量斜长石但是缺乏高钛金云母、黄长石、白榴石和霞石,全岩化学中SiO2、Al2O3明显高于前者,而TiO2、CaO、MgO、K/Na和Mg#值要比钾霞橄黄长岩低。
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Basanite and tephrite from Mt. Crater, Cape Bird and southern bank of Bonney Lake are considered as a major result of partial melting of equilibrium in the mantle, fusibility f=1. 5-7%, mantle reservior are enriched in LREE and Yb, and latite from Cape Rodeys and Cape Evens as a results of magmatic fractional crystallization, crystallinity F=58. 09-70.72%, its primary magama is almost the same as basanite in study area.
博尼湖南岸、克雷克特山和鸟角碧玄岩是地幔平衡部分熔融作用的产物,地幔部分熔融度f为1.5-7%,地幔源区为轻稀土富集型,并富集重稀土元素Yb;罗德角和伊万思角安粗岩是岩浆分离结晶作用的产物,结晶度F为58.09-70.72%,伊万思角高于罗德角,它们的母岩浆相当于本区的碧玄岩。
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leucite-tephrite:白榴石碱玄岩
leucite-basanite 白榴石碧玄岩 | leucite-tephrite 白榴石碱玄岩 | leucitite 白榴岩
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leucite-tephrite:白榴碱玄岩
"白霞二长安山岩","leucite tautivite" | "白榴碱玄岩","leucite tephrite" | "白榴霞斜岩","leucite theralite"