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Kamafugites

delete2025-07-30
delete0
PRE
AI
F
Francesca Innocenzi *
S
Sara Ronca
S
Samuele Agostini
V
Vincenza Guarino
S
Stephen Foley
M
Michele Lustrino
DOI：10.1016/j.earscirev.2025.105238delete
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摘要

摘要

En 中文
卡马富吉特岩是特殊的火山岩，其矿物学及组成上的独特性主要与大陆下地幔中发育的过程有关。这类岩石极为罕见，仅见于三个产地：东非裂谷西支[托罗安科莱（乌干达）和维龙加（刚果民主共和国）火山省]、意大利中部（亚平宁内陆省）以及巴西东南部（阿拉瓜亚巴高原火成省和戈亚斯碱性省）。卡马富吉特岩无法用于推断特定的地球动力学环境，因为其三种变体分别产出于远离活动带的板内（巴西）、大陆裂谷（乌干达）及复杂（挤压至伸展；意大利）的地球动力学框架中。它们的共生组合包括原生卡尔硅石、硅镁石、橄榄石、白榴石、金云母、钙钛矿、霞石及其他次要相，反映了强烈的超基性至基性全岩成分以及碱质（主要为K₂O）富集，从而导致超钾质和钾质亲缘性。巴西和东非裂谷的卡马富吉特岩在主量氧化物（如高TiO₂、Fe₂O₃(tot)）和微量元素分布（高大离子亲石元素，低Th-U-Nb）上表现出显著重叠，而意大利的卡马富吉特岩在不相容元素模式上差异显著（Th-U-Pb处峰值，Ba-Nb-Ta-Ti处谷值）。Sr-Nd-Pb-B同位素比值也表现出广泛变化。卡马富吉特岩的矿物学及地球化学特征并非由四相无挥发分橄榄岩地幔源区产生，而是在含金云母的辉石岩源区中，并含有不同比例的模态碳酸盐。意大利的卡马富吉特岩以其独特的全岩及Sr-Nd-Pb同位素组成脱颖而出，这使其与巴西和东非裂谷的变体明显区别开来，并解释为由俯冲改造的地幔生成，伴随广泛的地壳物质再循环。
Keyword:
Kamafugites
Kalsilite
Ultrapotassic rocks
Mantle metasomatism
AI总结

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期刊

E
Earth-Science Reviews
IF:
10
论文数:
3.9K
被引数:
4.2W

机构

I
istituto di geoscienze e georisorse – cnr
学者数:
1
论文数: 1
被引数: 0
U
università di napoli "federico ii"
学者数:
95
论文数: 50
被引数: 0
S
Sapienza Università di Roma
学者数:
295
论文数: 112
被引数: 0
M
Macquarie University
学者数:
1.2W
论文数: 1.5W
被引数: 2.2W
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引用论文

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