Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting最新文献_第6页

Hydrogeology of east-central Union County, northeastern New Mexico 新墨西哥州东北部联合县中东部的水文地质学

Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting Pub Date : 2013-04-12 DOI: 10.56577/sm-2013.48

G. Rawling

引用次数: 3

Using Uranium Isotopes to Determine Salinity Sources in Rio Grande Waters 利用铀同位素确定格兰德河水域的盐度来源

Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting Pub Date : 2013-04-12 DOI: 10.56577/sm-2013.11

Lin Ma, A. Szynkiewicz, D. Borrok, J. McIntosh

引用次数: 0

Corrections to Ages of Paleomagnetic Reversals and Ammonite Zone Boundaries from Those Reported in the Gradstein et al. 2012 Time Scale for K-Pg Boundary Rocks, San Juan Basin, New Mexico 新墨西哥圣胡安盆地K-Pg边界岩时间尺度对古地磁倒转年龄和菊石带边界的修正

Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting Pub Date : 2013-04-12 DOI: 10.56577/sm-2013.47

J. Fassett

引用次数: 0

Irrigation Efficiency Improvements: Technical, Economic, and Policy Issues 提高灌溉效率:技术、经济和政策问题

Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting Pub Date : 2013-04-12 DOI: 10.56577/sm-2013.15

F. Ward

引用次数: 0

Groundwater-Fed Wetlands in the La Cienega Area, Santa Fe County, New Mexico 新墨西哥州圣达菲县La Cienega地区地下水湿地

Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting Pub Date : 2013-04-12 DOI: 10.56577/sm-2013.37

P. Johnson, D. Koning, S. Timmons

引用次数: 0

Genesis of the Caballo and Burro Mountains REE-bearing Episyenite 卡巴略山和巴罗山含ree辉长岩成因

Proceedings Volume: "Hydrology and History of the Rio Grande", New Mexico Geological Society, 2013 Annual Spring Meeting Pub Date : 2013-04-12 DOI: 10.56577/sm-2013.71

Annelise M. Riggins, N. Dunbar, V. McLemore, K. Frempong, M. Heizler, W. Mcintosh

{"title":"Genesis of the Caballo and Burro Mountains REE-bearing Episyenite","authors":"Annelise M. Riggins, N. Dunbar, V. McLemore, K. Frempong, M. Heizler, W. Mcintosh","doi":"10.56577/sm-2013.71","DOIUrl":"https://doi.org/10.56577/sm-2013.71","url":null,"abstract":"Extraordinarily potassium feldspar-rich rocks, termed “episyenite”, exposed in Proterozoic basement in the Caballo and Burro Mountains, New Mexico, have anomalously high concentrations of U, Th and rare earth elements (REE). Episyenite bodies may have been emplaced as magmatic dikes, or formed by interaction of potassium-rich metasomatic fluids with Proterozoic basement. Field investigations show that brick-red episyenite tend to occur as clusters of elongate, sub-parallel bodies. Contacts between episyenite and host rock are typically gradational, along which transitional mineralogy, colors and textures are exhibited. Alteration and reddening of host rock has been observed along fractures. Spatial association of episyenites with pegmatite and aplite dikes, mafic xenoliths and complex textural variations in the host rock suggest that episyenites may be emplaced/formed near the margins of older plutons. Textural, mineralogical and chemical variations between granitic basement, episyenite and transitional rocks were characterized by electron microprobe. Host rocks typically contain unaltered plagioclase, Kfeldspar, quartz, biotite and magnetite with accessory zircon and monazite. Plagioclase and K-feldspar both contain patchy perthitic textures and quartz inclusions. Similar original mineralogy can be recognized in transitional samples, but are overprinted by extensive alteration. Many primary plagioclase and K-feldspar are surrounded by rims of secondary K-feldspar. The secondary K-feldspar is significantly less fractured, displays no perthititic textures, and contains micron size hematite inclusions. The most reddened episyenites are composed almost entirely of secondary, interlocking Kfeldspar, with vein quartz and accessory amounts of zircon, apatite, rutile and hematite. K-feldspars crystals display no relict igneous textures. In one sample from the Caballo Mountains, a large REEbearing phase was discovered, possibly the mineral parisite. Qualitative scans show it contains La, Ce, Pr, Nd, Y, Ca and F. In a second sample from the Caballos, a zircon crystal interpreted to be primary has been partially replaced by a REE-bearing alteration rind. Field and microprobe observations suggest that episyenites are metasomatic in origin, formed by K-rich fluids migrating along fractures in Proterozoic basement, and are not primary igneous intrusions. Origin of the fluid responsible for metasomatism is, at this time, unknown. In the Caballo Mountains, the C-O Bliss Formation truncates episyenites and contains episyenite clasts in its basal transgressive lag, constraining metasomatism to older than late Cambrian. Similar stratigraphic control is not present in the Burro Mountains. Cambrian-Ordovician carbonatite and alkaline magmatism with associated Kmetasomatism is well documented in southern Colorado and New Mexico. Though no carbonatite or alkaline intrusions are exposed in the Caballo or Burro Mountains, episyenites may be related to unexposed C-O intr","PeriodicalId":363585,"journal":{"name":"Proceedings Volume: \"Hydrology and History of the Rio Grande\", New Mexico Geological Society, 2013 Annual Spring Meeting","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121861731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0