کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8911905 | 1639048 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Detailed volcanic morphology of Daisan-Miyako Knoll in the southern Ryukyu Arc
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Detailed volcanic morphology of Daisan-Miyako Knoll in the southern Ryukyu Arc Detailed volcanic morphology of Daisan-Miyako Knoll in the southern Ryukyu Arc](/preview/png/8911905.png)
چکیده انگلیسی
High-resolution bathymetric mapping using an autonomous underwater vehicle and a survey vessel was conducted at Daisan-Miyako Knoll in the southern Ryukyu Arc. This paper presents for the first time the detailed volcanic morphology of a submarine edifice that previously was poorly explored, and discusses its formation process and relation to arc volcanism and tectonics. Bathymetry shows morphological evidence that Daisan-Miyako Knoll is a stratovolcano with three caldron-like depressions (>1â¯km in diameter), a central cone, and multiple lava flows at the summit. The main edifice is conical with a basal diameter of 8-10â¯km and relief of 1000-1100â¯m, with a summit depth of 779â¯m. The central cone that stands inside the depressions has a circular crater. Numerous blocks up to 10â¯m wide are distributed around the crater, indicating a previous explosive eruption. Lava flows erupted from the central cone have a maximum thickness of 46â¯m at the flow margins and a maximum flow length of 1.9â¯km. The total flow area is 1.5â¯km2 and the estimated volume is 0.03â¯km3. The relatively thick lava flows (up to 46â¯m) with steep-sided margins (30-40°) and curtain-folded surface textures suggest that silicic magmas erupted, and their fresh appearance indicates that lava-flow eruptions (the most recent volcanic activity) occurred during the Quaternary. The volcanic features at Daisan-Miyako Knoll are aligned mainly in the NW-SE direction, suggesting that volcanism here may be controlled primarily by arc-parallel extension. No volcanic edifices have been confirmed on the trench side of Daisan-Miyako Knoll, therefore this edifice defines the location of the arc volcanic front in this region. From the larger rhyolitic edifices (>10â¯km wide) around Daisan-Miyako Knoll along the front, it is inferred that silicic arc volcanism is extending from the central to southern submarine Ryukyu Arc.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 404, 1 October 2018, Pages 97-110
Journal: Marine Geology - Volume 404, 1 October 2018, Pages 97-110
نویسندگان
Hiroki Minami, Yasuhiko Ohara,