Catastrophic growth of totally molten magma chambers in months to years

被引:5
作者
Annen, Catherine [1 ]
Latypov, Rais [2 ]
Chistyakova, Sofya [2 ,3 ]
Cruden, Alexander R.
Nielsen, Troels F. D. [4 ]
机构
[1] CAS, Inst Geophys, Prague 4, Czech Republic
[2] Univ Witwatersrand, Sch Geosci, Johannesburg, South Africa
[3] Monash Univ, Sch Earth Atmosphere & Environm, Melbourne, Vic, Australia
[4] Geol Survey Denmark & Greenland, Dept Petr & Econ Geol, Copenhagen, Denmark
基金
澳大利亚研究理事会; 新加坡国家研究基金会;
关键词
LARGE IGNEOUS PROVINCES; SKAERGAARD LIQUID LINE; EAST GREENLAND; STILLWATER COMPLEX; VOLCANIC COMPLEX; CENTRAL ANDES; EMPLACEMENT; INTRUSION; CRYSTALLIZATION; PLUTON;
D O I
10.1126/sciadv.abq0394
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 vertical growth rate of basaltic magma chambers remains largely unknown with available estimates being highly uncertain. Here, we propose a novel approach to address this issue using the classical Skaergaard intrusion that started crystallizing from all margins inward only after it had been completely filled with magma. Our numerical simulations indicate that to keep the growing Skaergaard magma chamber completely molten, the vertical growth rate must have been on the order of several hundreds to a few thousands of meters per year, corresponding to volumetric flow rates of tens to hundreds of cubic kilometers per year. These rates are several orders of magnitude higher than current estimates and were likely achieved by rapid subsidence of the floor rocks along faults. We propose that the Skaergaard is a plutonic equivalent of supereruptions or intrusions that grow via catastrophically rapid magma emplacement into the crust, producing totally molten magma chambers in a matter of a few months to dozens of years.
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页数:9
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