Quartz-bearing rhyolitic melts in the Earth's mantle

被引：12
|
作者：
Dallai, Luigi [1 ,2 ,3 ]
Bianchini, Gianluca [4 ]
Avanzinelli, Riccardo [5 ]
Deloule, Etienne [6 ]
Natali, Claudio [5 ,7 ]
Gaeta, Mario [1 ]
Cavallo, Andrea [8 ]
Conticelli, Sandro [5 ,7 ]
机构：
[1] Sapienza Univ Roma, Dipartimento Sci Terra, PleA Moro 5, I-00185 Rome, Italy
[2] INGV, Via Vigna Murata 605, I-00143 Rome, Italy
[3] CNR, Area Ric Pisa, IGG, Via Moruzzi 1, I-56127 Pisa, Italy
[4] Univ Ferrara, Dipartimento Fis & Sci Terra, Via G Saragat 1, I-44122 Ferrara, Italy
[5] Univ Firenze, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy
[6] Univ Lorraine, UMR 7358, CNRS, CRPG, 15 Rue Notre Dame Pauvres, F-54501 Vandoeuvre Les Nancy, France
[7] CNR, IGAG, Area Ric Roma 1, SP 35d,9, I-00010 Montelibretti, RM, Italy
[8] Certema Scarl, SP Cipressino Km 10, I-58044 Borgo Santa Rita, Cinigiano Gr, Italy
来源：
NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期
关键词：
POSTCOLLISIONAL VOLCANISM; BETIC CORDILLERA; CALC-ALKALINE; CRUSTAL; OXYGEN; MAGMATISM; ORIGIN; ROCKS; CALIBRATION; EXHUMATION;
D O I：
10.1038/s41467-022-35382-3
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The occurrence of rhyolite melts in the mantle has been predicted by high pressure-high temperature experiments but never observed in nature. Here we report natural quartz-bearing rhyolitic melt inclusions and interstitial glass within peridotite xenoliths. The oxygen isotope composition of quartz crystals shows the unequivocal continental crustal derivation of these melts, which approximate the minimum composition in the quartz-albite-orthoclase system. Thermodynamic modelling suggests rhyolite was originated from partial melting of near-anhydrous garnet-bearing metapelites at temperatures similar to 1000 degrees C and interacted with peridotite at pressure similar to 1GPa. Reaction of rhyolite with olivine converted lherzolite rocks into orthopyroxene-domains and orthopyroxene + plagioclase veins. The recognition of rhyolitic melts in the mantle provides direct evidence for element cycling through earth's reservoirs, accommodated by dehydration and melting of crustal material, brought into the mantle by subduction, chemically modifying the mantle source, and ultimately returning to surface by arc magmatism.
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页数：9
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