Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jvolgeores.2017.09.005 |
Emplacement dynamics and timescale of a Holocene flow from the Cima Volcanic Field (CA): Insights from rheology and morphology | |
Soldati, Arianna; Beem, Jordon; Gomez, Francisco; Huntley, John Warren; Robertson, Timothy; Whittington, Alan | |
通讯作者 | Soldati, Arianna |
来源期刊 | JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
![]() |
ISSN | 0377-0273 |
EISSN | 1872-6097 |
出版年 | 2017 |
卷号 | 347页码:91-111 |
英文摘要 | We present a rheological and morphological study of a Holocene lava flow emitted by a monogenetic cinder cone in the Cima Volcanic Field, eastern California. Our field observations focused on surface morphology, which transitions from smooth core extrusions near the vent to jagged ’a’(a) over bar blocks over the majority of the flow, and on channel and levee dimensions. We collected airborne photogrammetry data and used it to generate a digital elevation model. From this, the total flow volume was estimated and surface roughness was quantified in terms of standard deviation of the real surface (5 cm resolution) from the software-generated 1 m-average plane. Sample textural analyses revealed that the near-vent portion of the flow is significantly more crystalline (phi(xtal) = 0.95 +/- 0.04) than the main flow body (phi(xtal) = 0.66 +/- 0.11). The rheology of Cima lavas was determined experimentally by concentric cylinder viscometry between 1550 degrees C and 1160 degrees C, including the first subliquidus rheology measurements for a continental intraplate trachybasaltic lava. The experimentally determined effective viscosity increases from 54 Pa.s to 1361 Pa.s during cooling from the liquidus (similar to 1230 degrees C) to 1160 degrees C, where crystal fraction is 0.11. The lava viscosity over this range is still lower than most basaltic melts, due to the high alkali content of Cima lavas (similar to 6 wt% Na2O + K2O). Monte Carlo simulations were used to account for and propagate experimental uncertainties, and to determine which rheological model (Bingham, power law, or Herschel-Bulkley) provides the best-fit of the obtained rheological data. Results suggest that Bingham and Herschel-Bulkley models are statistically indistinguishable from each other, and that both fit the data better than a power law model. By combining field observations and experimental results, we reconstructed the eruption temperature and few days-long emplacement history of the Cima flow. (C) 2017 Elsevier B.V. All rights reserved. |
英文关键词 | Viscosity Rheology Morphology Lava flow Trachybasalt Cima Volcanic Field |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000418967000006 |
WOS关键词 | SUBLIQUIDUS MAGMAS ; MOJAVE DESERT ; VISCOSITY MEASUREMENTS ; EFFUSION RATES ; SILICATE MELTS ; LAVA FLOWS ; AA-LAVAS ; PAHOEHOE ; TRANSITION ; SUSPENSIONS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/200887 |
作者单位 | Univ Missouri, Dept Geol Sci, Columbia, MO 65211 USA |
推荐引用方式 GB/T 7714 | Soldati, Arianna,Beem, Jordon,Gomez, Francisco,et al. Emplacement dynamics and timescale of a Holocene flow from the Cima Volcanic Field (CA): Insights from rheology and morphology[J],2017,347:91-111. |
APA | Soldati, Arianna,Beem, Jordon,Gomez, Francisco,Huntley, John Warren,Robertson, Timothy,&Whittington, Alan.(2017).Emplacement dynamics and timescale of a Holocene flow from the Cima Volcanic Field (CA): Insights from rheology and morphology.JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,347,91-111. |
MLA | Soldati, Arianna,et al."Emplacement dynamics and timescale of a Holocene flow from the Cima Volcanic Field (CA): Insights from rheology and morphology".JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 347(2017):91-111. |
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。