Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B32058.1 |
Late Paleozoic supervolcano-scale eruptions in Maine, USA | |
Seaman, S. J.1; Hon, R.2; Whitman, M.1; Wobus, R. A.3; Hogan, J. P.4; Chapman, M.5; Koteas, G. C.6; Rankin, D.7; Pinan-Llamas, A.8; Hepburn, J. C.2 | |
2019-11-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:1995-2010 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Contemporaneous mafic and felsic magmatism occurs in a variety of tectonic settings where continental crust is invaded by mantle-derived basaltic melt. Bimodal magmatism, including supervolcano-scale eruptions, occurred in both the Coastal Maine magmatic province and the Central Maine magmatic belt during two phases of accretion of Avalonia to the margin of North America in the Late Silurian and Early Devonian. The magmatic complexes of both coastal and central Maine provide an opportunity to examine the storage and eruption settings of basaltic and rhyolitic magma from the base of plutons through the top of their volcanic successions. The coastal and central Maine magmatic provinces represent the southwesternmost part of a >70,000 km(2) bimodal igneous province that includes volcanic and plutonic rocks that extend into the Gaspe Peninsula of Quebec, Canada. Taken together, these magmatic belts embody a large igneous province-scale locus of igneous activity. Four complexes in Maine are part of the Coastal Maine magmatic province and erupted between ca. 424 and 420 Ma, producing volcanic successions up to 3 km thick. The fifth large silicic eruptive complex examined here, the Katandin/Traveler complex of central Maine, is part of the Central Maine magmatic belt, and it produced the ca. 407 Ma Traveler rhyolite, of which similar to 3200-m-thick sections are preserved. The three coastal Maine magmatic complexes for which an arguably clear genetic relationship exists between pluton and volcanic succession are smaller than the Katandin/Traveler system (on the basis of area of the remnant magma chamber of Mount Desert Island [similar to 500 km(2)] compared to that of the Katandin batholith [similar to 1350 km(2)]), but they produced volcanic successions from 0.65 (Vinalhaven) to at least 2.2 km (Mount Desert/Cranberry Isles and Isle au Haut) thick. Single ignimbrite thicknesses in these complexes range from 350 m to 860 m. The remaining coastal Maine magmatic complex discussed here, the Eastport series, differs from the other four in that the pluton(s) from which the similar to 2.4-km-thick succession originated has (have) not been identified. A detailed integration of gravity and magnetic data indicates that strong positive magnetic anomalies and weaker gravity anomalies support a model of thin felsic igneous rocks underlain by a significant volume of mafic to ultramafic rocks. The dominance of gabbro in the coastal Maine crustal column suggests that crustal extension and intrusion of mantle-derived basalt drove the development of bimodal magmatic complexes. The gabbro:granite ratio in the subsurface of the Coastal Maine magmatic province, and the presence of hornblende, rather than pyroxene, as the main ferromagnesian mineral in the gabbros of the province are consistent with a model of flux of hydrous basalt into the crust of similar to 10(-2) m(3)/m(2)/yr, leading to a ratio of crustal melt to mantle-derived basaltic melt of similar to 1:0.25, if the invading basaltic melt was wet (similar to 5.6 wt % water). The absence of andesites in this setting is likely a consequence of the subduction-related origin of the hydrous basalts, resulting in the generation of dacitic rather than andesitic melts in lower-crustal mush zones, and the eventual extraction of interstitial melts from those dacitic melts in the upper crust to produce the granites and rhyolites that dominate the igneous rocks at the present surface in coastal and central Maine. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000493796300014 |
WOS关键词 | TAUPO VOLCANIC ZONE ; SOUTHWESTERN NEW-BRUNSWICK ; LARGE IGNEOUS PROVINCES ; MOUNT-DESERT-ISLAND ; ASH-FLOW CALDERAS ; NEW-ZEALAND ; BASALTIC INJECTIONS ; CANADA IMPLICATIONS ; MAGMATIC PROCESSES ; OCEANIC PLATEAUS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/188066 |
专题 | 地球科学 |
作者单位 | 1.Univ Massachusetts, Dept Geosci, 611 North Pleast St, Amherst, MA 01003 USA; 2.Boston Coll, Dept Earth & Environm Sci, Devlin Hall,140 Commonwealth Ave, Chestnut Hill, MA 02467 USA; 3.Williams Coll, Dept Geosci, Clark Hall, Williamstown, MA 01267 USA; 4.Missouri Univ Sci & Technol, Dept Geol & Geophys, 129 McNutt Hall,1400 N Bishop, Rolla, MO 65409 USA; 5.Morehead State Univ, Dept Earth & Space Sci, 235 Martindale Dr, Morehead, KY 40351 USA; 6.Norwich Univ, Dept Geol, 158 Harmon Dr, Northfield, VT 05663 USA; 7.US Geol Survey, 12201 Sunrise Valley Dr, Reston, VA 20192 USA; 8.Indiana Univ Purdue Univ Ft Wayne, Dept Geosci, 2101 East Coliseum Blvd, Ft Wayne, IN 46805 USA |
推荐引用方式 GB/T 7714 | Seaman, S. J.,Hon, R.,Whitman, M.,et al. Late Paleozoic supervolcano-scale eruptions in Maine, USA[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:1995-2010. |
APA | Seaman, S. J..,Hon, R..,Whitman, M..,Wobus, R. A..,Hogan, J. P..,...&Hepburn, J. C..(2019).Late Paleozoic supervolcano-scale eruptions in Maine, USA.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,1995-2010. |
MLA | Seaman, S. J.,et al."Late Paleozoic supervolcano-scale eruptions in Maine, USA".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):1995-2010. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论