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DOI | 10.1130/B35337.1 |
The timing and compositional evolution of volcanism within northern Harrat Rahat, Kingdom of Saudi Arabia | |
Stelten, Mark E.1; Downs, Drew T.1; Champion, Duane E.1; Dietterich, Hannah R.2; Calvert, Andrew T.1; Sisson, Thomas W.1; Mahood, Gail A.3; Zahran, Hani4 | |
2020-07-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:7-8页码:1381-1403 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Saudi Arabia |
英文摘要 | Harrat Rahat, one of several large, basalt-dominated volcanic fields in western Saudi Arabia, is a prime example of continental, intraplate volcanism. Excellent exposure makes this an outstanding site to investigate changing volcanic flux and composition through time. We present 93 (40)/Ar-39 ages and six Cl-36 surface-exposure ages for volcanic deposits throughout northern Harrat Rahat that, when integrated with a new geologic map, define 12 eruptive stages. Exposed volcanic deposits in the study area erupted <1.2 Ma, and 214 of 234 eruptions occurred <570 ka. Two eruptions occurred in the Holocene, including a historically described basalt eruption in 1256 C.E. and a trachyte eruption newly recognized as Holocene (4.2 +/- 5.2 ka). An estimated similar to 82 km(3) (dense rock equivalent) of volcanic product have erupted since 1.2 Ma, though this is a lower limit due to concealment of deposits >570 ka. Over the past 570 k.y., the average eruption rate was 0.14 km(3)/k.y., but volcanism was episodic with periods alternating between low (0.040.06 km(3)/k.y.) and high (0.1-0.3 km(3)/k.y.) effusion rates. Before 180 ka, eruptions vented from the volcanic field's dominant eastern vent axis and from a subsidiary, diffuse, western vent axis. After 180 ka, volcanism focused along the eastern vent axis, and the composition of volcanism varied systematically along its length from basalt dominated in the north to trachyte dominated in the south. We hypothesize that these compositional variations <180 ka reflect the growth of a mafic intrusive complex beneath the southern portion of the vent axis, which led to the development of evolved magmas. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000545115400003 |
WOS关键词 | AR-40/AR-39 GEOCHRONOLOGY ; RED-SEA ; FIELD ; GEOCHEMISTRY ; LITHOSPHERE ; HISTORY ; OREGON ; GROWTH ; PLATE ; RATES |
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/289417 |
专题 | 地球科学 |
作者单位 | 1.US Geol Survey, Calif Volcano Observ, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 2.US Geol Survey, Alaska Volcano Observ, 4230 Univ Dr,Suite 100, Anchorage, AK 99058 USA; 3.Stanford Univ, Dept Geol Sci, Stanford, CA 94305 USA; 4.Saudi Geol Survey, Natl Ctr Earthquakes & Volcanoes, POB 54141, Jeddah 21514, Saudi Arabia |
推荐引用方式 GB/T 7714 | Stelten, Mark E.,Downs, Drew T.,Champion, Duane E.,et al. The timing and compositional evolution of volcanism within northern Harrat Rahat, Kingdom of Saudi Arabia[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(7-8):1381-1403. |
APA | Stelten, Mark E..,Downs, Drew T..,Champion, Duane E..,Dietterich, Hannah R..,Calvert, Andrew T..,...&Zahran, Hani.(2020).The timing and compositional evolution of volcanism within northern Harrat Rahat, Kingdom of Saudi Arabia.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(7-8),1381-1403. |
MLA | Stelten, Mark E.,et al."The timing and compositional evolution of volcanism within northern Harrat Rahat, Kingdom of Saudi Arabia".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.7-8(2020):1381-1403. |
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