Rapid assembly and crystallization of a fossil large-volume silicic magma chamber

被引:45
|
作者
Eddy, Michael P. [1 ]
Bowring, Samuel A. [1 ]
Miller, Robert B. [2 ]
Tepper, Jeffrey H. [3 ]
机构
[1] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
[2] San Jose State Univ, Dept Geol, San Jose, CA 95192 USA
[3] Univ Puget Sound, Dept Geol, Tacoma, WA 98416 USA
基金
美国国家科学基金会;
关键词
ZIRCON; GEOCHRONOLOGY; CONSTRUCTION; CALIBRATION; RESERVOIRS; EVOLUTION;
D O I
10.1130/G37631.1
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The rates at which large volumes of eruptible, silicic (>65 wt% SiO2) magma (magma chambers) are assembled, as well as their longevity in the upper crust, remain controversial. This controversy is due, in part, to a missing record of granitoid plutonic complexes that represent large fossil upper crustal magma chambers. We present new geologic mapping and high-precision U-Pb zircon geochronology from the Eocene Golden Horn batholith in Washington State, USA. These data reveal that the batholith was constructed as a series of sills over 739 +/- 34 k.y. Topographic relief of >2 km permits volume estimates for 4 of the sills, the largest of which, a >424 km(3) rapakivi granite, was emplaced over 26 +/- 25 k.y. at a rate of similar to 0.0125 km(3)/yr. This rate exceeds those needed to build large, silicic magma chambers in thermal models, and we suggest that that this unit may represent the first fossil magma chamber of this type recognized in the geologic record.
引用
收藏
页码:331 / 334
页数:4
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