Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development.
Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development.
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玄武岩源自早期伊豆-小笠南-马里亚纳岛弧发育过程中的高难熔地幔源
DOI：
10.1038/s41467-021-21980-0
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发表时间：
2021-03-19
影响因子：
16.6
通讯作者：
Sun W
中科院分区：
文献类型：
--
作者：
Li H;Arculus RJ;Ishizuka O;Hickey-Vargas R;Yogodzinski GM;McCarthy A;Kusano Y;Brandl PA;Savov IP;Tepley FJ 3rd;Sun W
早期俯冲带和弧发育的岩浆性质不同于成熟系统。伊豆-小笠原-马里亚纳（IBM）系早期以低Ti-K拉斑玄武岩和玻安岩为主。从位于IBM最古老的残余弧以西的奄美三角盆地（ASB）中发现的玄武岩喷发时间约为49 Ma。这是在以弧前玄武岩（FAB）为代表的俯冲开始（51-52 Ma）之后的300万年，处于FAB-玻安岩和典型弧岩浆作用之间的临界点。我们表明ASB玄武岩是低Ti-K、含铝尖晶石拉斑玄武岩，与大洋中脊（莫尔）、弧后盆地、岛弧或洋岛玄武岩相比有所不同。它们的上地幔源是热的、还原的、难熔的橄榄岩，这表明它们之前是熔融提取的。ASB玄武岩从斜长石-尖晶石橄榄岩相边界的压力（~0.7-2 GPa）迅速转移到地表。残留的一个polybaric-polythermal矿物保存在这个玄武岩，并没有被抹杀在持久的充电-混合-抽头-压裂制度典型的莫尔或成熟的弧。
The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.
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影响因子：
3.9
作者：
ARCULUS, RJ;WILLS, KJA
通讯作者：
WILLS, KJA
影响因子：
3.5
作者：
Herzberg, C.;Asimow, P. D.
通讯作者：
Asimow, P. D.
影响因子：
3.5
作者：
Gale, Allison;Dalton, Colleen A.;Schilling, Jean-Guy
通讯作者：
Schilling, Jean-Guy
影响因子：
5.3
作者：
HOFMANN, AW;JOCHUM, KP;WHITE, WM
通讯作者：
WHITE, WM
影响因子：
5.3
作者：
Gurnis, Michael;Van Avendonk, Harm;Carrington, Luke
通讯作者：
Carrington, Luke