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Magmatic Response to Subduction Initiation, Part II: Boninites and Related Rocks of the Izu‐Bonin Arc From IOPD Expedition 352
Geochemistry, Geophysics, Geosystems ( IF 4.480 ) Pub Date : 2020-11-16 , DOI: 10.1029/2020gc009093 John W. Shervais 1 , Mark K. Reagan 2 , Marguerite Godard 3 , Julie Prytulak 4 , Jeffrey G. Ryan 5 , Julian A. Pearce 6 , Renat R. Almeev 7 , Hongyan Li 8 , Emily Haugen 1, 9 , Timothy Chapman 10, 11 , Walter Kurz 12 , Wendy R. Nelson 13 , Daniel E. Heaton 14 , Maria Kirchenbaur 7, 15 , Kenji Shimizu 16 , Tetsuya Sakuyama 17 , Scott K. Vetter 18 , Yibing Li 19 , Scott Whattam 20
Geochemistry, Geophysics, Geosystems ( IF 4.480 ) Pub Date : 2020-11-16 , DOI: 10.1029/2020gc009093 John W. Shervais 1 , Mark K. Reagan 2 , Marguerite Godard 3 , Julie Prytulak 4 , Jeffrey G. Ryan 5 , Julian A. Pearce 6 , Renat R. Almeev 7 , Hongyan Li 8 , Emily Haugen 1, 9 , Timothy Chapman 10, 11 , Walter Kurz 12 , Wendy R. Nelson 13 , Daniel E. Heaton 14 , Maria Kirchenbaur 7, 15 , Kenji Shimizu 16 , Tetsuya Sakuyama 17 , Scott K. Vetter 18 , Yibing Li 19 , Scott Whattam 20
Affiliation
International Ocean Discovery Program Expedition 352 to the Izu‐Bonin forearc cored over 800 m of basement comprising boninite and boninite‐series lavas. This is the most extensive, well‐constrained suite of boninite series lavas ever obtained from in situ oceanic crust. The boninites are characterized as high‐silica boninite (HSB), low‐silica boninite (LSB), or basaltic boninite based on their SiO2‐MgO‐TiO2 relations. The principal fractionation products of all three series are high‐Mg andesites (HMA). Lavas recovered >250 meters below seafloor (mbsf) erupted at a forearc spreading axis and are dominated by LSB and HMA. Lavas recovered from <250 mbsf erupted off‐axis and are dominated by HSB. The axial and off‐axis lavas are characterized by distinct chemostratigraphic trends in their major, trace, and isotopic compositions. The off‐axis lavas are chemically similar to boninite from the type locality at Chichijima, with concave‐upward rare earth elements patterns. In contrast, the more abundant axial lavas have distinctly light rare earth element‐depleted patterns and represent a new, previously unsampled precursor to the Chichijima‐type boninite lavas. Petrogenetic modeling suggests that the axial lavas formed by fluxing of refractory mantle (likely the residue from forearc basalt extraction), with amphibolite‐facies melt derived from subducting altered oceanic crust. The upper, off‐axis lavas require an additional component of sediment‐derived melt in addition. Both models are consistent with previously published isotopic data.
中文翻译:
俯冲作用的岩浆反应,第二部分:IOPD远征352号伊豆-波宁弧的贝尼石及相关岩石
伊豆-波宁前臂的国际海洋发现计划第352号探险队在800 m的地下室中挖了芯,这些地下室包括comprising石和and石系列熔岩。这是有史以来从原地洋壳获得的,范围最广,约束最严格的邦尼石系列熔岩。基于SiO 2 -MgO-TiO 2的特征,这些亚硅酸盐的特征为高硅质硅酸盐(HSB),低硅质硅酸盐(LSB)或玄武质贝氏体。关系。这三个系列的主要分馏产物均为高镁安山岩(HMA)。拉瓦斯(Lavas)在前臂扩散轴下爆发的海底(mbsf)下> 250米处恢复,并以LSB和HMA为主。从<250 mbsf的熔岩中恢复出来的熔岩离轴爆发,并以HSB为主。轴向和离轴熔岩的主要,痕量和同位素组成具有明显的化学地热趋势。离轴熔岩在化学性质上类似于千岛岛地区的邦尼石,具有向上凹的稀土元素形态。相比之下,更丰富的轴向熔岩具有明显的轻稀土元素贫化模式,并且代表了Chichijima型邦尼石熔岩的一种新的,以前未取样的前体。岩石成因模拟表明,轴向熔岩是由难熔地幔(可能是前玄武岩提取物中的残留物)的通量形成的,而闪石相的熔岩则来自俯冲蚀变的海洋地壳。上偏轴熔岩还需要来自沉积物的熔体的其他成分。两种模型均与先前发表的同位素数据一致。
更新日期:2021-01-13
中文翻译:
俯冲作用的岩浆反应,第二部分:IOPD远征352号伊豆-波宁弧的贝尼石及相关岩石
伊豆-波宁前臂的国际海洋发现计划第352号探险队在800 m的地下室中挖了芯,这些地下室包括comprising石和and石系列熔岩。这是有史以来从原地洋壳获得的,范围最广,约束最严格的邦尼石系列熔岩。基于SiO 2 -MgO-TiO 2的特征,这些亚硅酸盐的特征为高硅质硅酸盐(HSB),低硅质硅酸盐(LSB)或玄武质贝氏体。关系。这三个系列的主要分馏产物均为高镁安山岩(HMA)。拉瓦斯(Lavas)在前臂扩散轴下爆发的海底(mbsf)下> 250米处恢复,并以LSB和HMA为主。从<250 mbsf的熔岩中恢复出来的熔岩离轴爆发,并以HSB为主。轴向和离轴熔岩的主要,痕量和同位素组成具有明显的化学地热趋势。离轴熔岩在化学性质上类似于千岛岛地区的邦尼石,具有向上凹的稀土元素形态。相比之下,更丰富的轴向熔岩具有明显的轻稀土元素贫化模式,并且代表了Chichijima型邦尼石熔岩的一种新的,以前未取样的前体。岩石成因模拟表明,轴向熔岩是由难熔地幔(可能是前玄武岩提取物中的残留物)的通量形成的,而闪石相的熔岩则来自俯冲蚀变的海洋地壳。上偏轴熔岩还需要来自沉积物的熔体的其他成分。两种模型均与先前发表的同位素数据一致。