Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/6563853 |
| 报告编号 | DOE/ID/12079-23 |
| 来源ID | OSTI_ID: 6563853 |
| Summary of potassium/argon age dating, 1980 | |
| Evans, S.H. Jr.; Brown, F.H. | |
| 英文摘要 | A significant improvement in efficiency of the K-Ar laboratory was brought about by completion of a second extraction line. Two extractions can now be done routinely each day and the /sup 38/Ar spike ratios of the new table will permit dating of much younger samples than previously. Extensive K-Ar dating of samples from the Mineral Mountains shows intervals of silicic volcanism at 0.5, 0.8 and 7.5 m.y. K-Ar dating of plutonic units does not present a consistent picture, however. Plutonic events 35 to 40 m.y., 29 m.y. and 19 to 21 m.y. ago are suggested but interpretation must be considered preliminary. Joint programs with the US Geological Survey now underway to study the Rb-Sr and U-Pb systematics of the Mineral Mountains pluton should aid in unravelling its history. Dating of basalts from the Cove Creek Domes/Twin Peaks area, Utah, has aided in delineating the timing of basaltic volcanism. This adds to the already extensive data on the chronology of volcanic activity in the area. Dating of samples from the Beowawe Known Geothermal Resources Area, Nevada have confirmed earlier dates indicating major volcanism took place 38 m.y. ago and 17 to 16 m.y. ago. |
| 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 ; VOLCANIC ROCKS ; AGE ESTIMATION ; ARGON ; BASALT ; CHEMICAL COMPOSITION ; EXPERIMENTAL DATA ; MAPPING ; MINERALOGY ; NEVADA ; POTASSIUM ; UTAH ; VOLCANISM ; ALKALI METALS ; DATA ; ELEMENTS ; FLUIDS ; GASES ; IGNEOUS ROCKS ; INFORMATION ; METALS ; NONMETALS ; NORTH AMERICA ; NUMERICAL DATA ; RARE GASES ; ROCKS ; ROCKY MOUNTAIN REGION ; USA ; WESTERN REGION Geothermal Legacy 152004* -- Geothermal Data & Theory-- Isotope & Trace Element Studies |
| URL | http://www.osti.gov/scitech/servlets/purl/6563853 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/262901 |
| 推荐引用方式 GB/T 7714 | Evans, S.H. Jr.,Brown, F.H.. Summary of potassium/argon age dating, 1980,1980. |
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