Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/5209691 |
| 报告编号 | DOE/ID/12079-12 |
| 来源ID | OSTI_ID: 5209691 |
| Chemical trends in the Ice Springs basalt, Black Rock Desert, Utah | |
| Lynch, W.C.; Nash, W.P. | |
| 英文摘要 | The Holocene Ice Springs volcanic field of west-central Utah consists of 0.53 km/sup 3/ of tholeiitic basalts erupted as a sequence of nested cinder cones and associated lava flows. Whole rock x-ray fluorescence and atomic absorption analysis of ninety-six samples of known relative age document statistically significant inter- and intra-eruption chemical variations. Elemental trends include increases in Ti, Fe, Ca, P, and Sr and decreases in Si, K, Rb, Ni, Cr, and Zr with decreasing age. Microprobe analyses of microphenocrysts of olivine, plagioclase, and Fe-Ti oxides and of groundmass olivine, plagioclase, and clinopyroxene indicate limited chemical variation between mineral assemblages of the eruptive events. Petrographic analyses have identified the presence of minor amounts of silicic xenoliths, orthopyroxene megacrysts, and plagioclase xenocrysts. Potassium-argon determinations establish the existence of excess argon in the basaltic cinder (30.05 x 10/sup -12/ moles/gm) and in distal lava flows (8.29 x 10/sup -12/ moles/gm) which suggest apparent ages of 16 and 4.3 million years respectively. Strontium isotopic data (Puskar and Condie, 1973) show systematic variations from oldest eruptions (87Sr/86Sr=0.7052) to youngest eruptions (87Sr/86Sr=0.7059). |
| 出版年 | 1980 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 15 GEOTHERMAL ENERGY ; BASALT ; CHEMICAL ANALYSIS ; PETROGRAPHY ; MAGMA ; PHYSICAL PROPERTIES ; PETROGENESIS ; GEOLOGIC MODELS ; UTAH ; MINERALOGY ; ABUNDANCE ; ANORTHOSITES ; CHEMICAL COMPOSITION ; FELDSPARS ; IRON OXIDES ; LAVA ; OLIVINE ; PYROXENES ; QUANTITY RATIO ; STATISTICS ; TITANIUM OXIDES ; TRACE AMOUNTS ; VOLCANIC REGIONS ; X-RAY FLUORESCENCE ANALYSIS ; ALKALINE EARTH METAL COMPOUNDS ; CHALCOGENIDES ; GABBROS ; IGNEOUS ROCKS ; IRON COMPOUNDS ; IRON SILICATES ; MAGNESIUM COMPOUNDS ; MAGNESIUM SILICATES ; MATHEMATICS ; MINERALS ; NONDESTRUCTIVE ANALYSIS ; NORTH AMERICA ; OXIDES ; OXYGEN COMPOUNDS ; PLUTONIC ROCKS ; ROCKS ; ROCKY MOUNTAIN REGION ; SILICATES ; SILICON COMPOUNDS ; TITANIUM COMPOUNDS ; TRANSITION ELEMENT COMPOUNDS ; USA ; VOLCANIC ROCKS ; X-RAY EMISSION ANALYSIS Geothermal Legacy 150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989) |
| URL | http://www.osti.gov/scitech/servlets/purl/5209691 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/262694 |
| 推荐引用方式 GB/T 7714 | Lynch, W.C.,Nash, W.P.. Chemical trends in the Ice Springs basalt, Black Rock Desert, Utah,1980. |
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