Anomalously hot mantle source beneath the Dragon Flag Supersegment of the Southwest Indian Ridge: New evidence from crystallisation temperatures of mid-ocean ridge basalts

被引：2

作者：

Li, Jie ^{[1
,2
]}

Huang, Xiao-Long ^{[3
,4
]}

Li, Xiao-Hu ^{[1
,2
]}

Chu, Feng-You ^{[1
,2
]}

Zhu, Ji-Hao ^{[1
,2
]}

Zhu, Zhi-Min ^{[1
,2
]}

Wang, Hao ^{[1
,2
]}

机构：

[1] Minist Nat Resources, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China

[2] Minist Nat Resources, Inst Oceanog 2, Hangzhou 310012, Peoples R China

[3] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China

[4] CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China

来源：

LITHOS | 2021年 / 396卷

关键词：

Olivine thermometry; Crystallisation temperature; MORB; Southwest Indian Ridge; Melting anomaly; OLIVINE; SPINEL; ORIGIN; MELT; PETROGENESIS; PYROXENITE; PERIDOTITE; MAGMAS; MARION; LAVAS;

D O I：

10.1016/j.lithos.2021.106221

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Discontinuities in the magmatic activity along a spreading ridge are usually observed in ultraslow-spreading ridges with a thick crust. However, the reasons for such melting anomaly are unknown. The Dragon Flag Supersegment between the Indomed Fault Zone (FZ) and the Gallieni FZ on the Southwest Indian Ridge (SWIR) is characterised by ultra-thick oceanic crust (up to-10 km), and it provides a unique opportunity for studying magmatic crustal accretion at an ultraslow-spreading ridge. We determined the compositions of olivine-spinel pairs in mid-ocean ridge basalts (MORBs) collected from Segments 25 and 28 of the SWIR to estimate the temperatures of crystallisation and investigate the source lithologies. The olivine-spinel pairs were carefully screened and only those having crystallized in equilibrium were used for the temperature estimates. The Alin-olivine thermometer provided crystallisation temperatures that ranged from 1197 +/- 37 to 1393 +/- 21 degrees C. The 95th percentile calculated temperature (1345 degrees C) for the primitive olivine is-75 degrees C hotter than for olivines in MORBs from normal ridges but comparable to the data for plume-related oceanic island basalts. The olivines have Fe/Mn ratios and Ni, Ca, and Mn contents that are similar to those of olivines in MORBs from normal ridges, which suggests their derivation from a peridotite-dominant source with little contribution from fertile mantle components. Our results suggest a hot mantle reservoir is present beneath the Dragon Flag Supersegment, and that it is probably related to a mantle plume. (c) 2021 Elsevier B.V. All rights reserved.

引用

页数：10

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