Las Cruces Country III最新文献_第2页

U-Pb geochronology of middle�late Eocene intermediate volcanic rocks of the Palm Park Formation and Orejon Andesite in south-central New Mexico 新墨西哥州中南部棕榈园组中—晚始新世中间火山岩和奥列洪安山岩的U-Pb年代学

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.147

R. H. Creitz, B. Hampton, G. Mack, J. Amato

{"title":"U-Pb geochronology of middle�late Eocene intermediate volcanic rocks of the Palm Park Formation and Orejon Andesite in south-central New Mexico","authors":"R. H. Creitz, B. Hampton, G. Mack, J. Amato","doi":"10.56577/ffc-69.147","DOIUrl":"https://doi.org/10.56577/ffc-69.147","url":null,"abstract":"A bstrAct —U-Pb zircon ages from the middle–late Eocene intermediate volcanic rocks of the Palm Park Formation and Orejon Andesite provide new geochronologic constraint on the duration of volcanism that took place just after the Laramide orogeny and prior to the onset of latest Eocene bimodal volcanism and initiation of the Rio Grande rift in south-central New Mexico at ~36 Ma. Presented here are nine new U-Pb zircon ages (n=247 analyses) from the Organ, Doña Ana, Robledo, and Sierra de las Uvas Mountains that fall within a range of ~45–40 Ma. The oldest age determined from this study was collected from an ash-fall tuff exposed in the lower part of the Palm Park Formation in the Robledo Mountains (Apache canyon) and yields an age of 45.0±0.7 Ma. Three samples from intermediate volcanic flows in the Orejon Andesite of the Organ Mountains (Fillmore canyon) yield ages of 44.0±1.5, 43.8±0.4, and 42.8±1.5 Ma. Four samples were collected from a series of intermediate composition (andesite to dacite) volcanic flows in the Doña Ana Mountains (Cleofas canyon) and Robledo Mountains (Faulkner canyon) and yield ages of 41.6±0.7, 41.3±0.7, and two nearly-identical ages of 41.0±0.6 Ma. The youngest age reported from this study was determined from an ash-fall tuff exposed near the top of the Palm Park Formation in the eastern part of the Sierra de las Uvas fault block and yields an age of 39.6±0.5 Ma. New data are presented here, together with previously reported ages and fossil occurrences from the Palm Park Formation, Orejon Andesite, and equivalent units throughout south-central New Mexico, including the Cleofas Andesite and Rubio Peak Formation. Based on new ages and fossil age ranges, we favor a model where these rocks were erupted and deposited over a ~10 my period between ~46–36 Ma during which mantle wedge material was re-introduced throughout south-central New Mexico just prior to onset of the Rio Grande rift.","PeriodicalId":253436,"journal":{"name":"Las Cruces Country III","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123486254","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: 3

Mineral resources of the Do�a Ana mountains mining district, Do�a Ana County, New Mexico 新墨西哥州多阿纳县多阿纳山区矿区的矿产资源

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.203

V. McLemore

引用次数: 0

Authigenic opal and calcite beds in axial-fluvial sediment of the Camp Rice Formation (Pliocene-lower Pleistocene), Rincon Hills: Third�day (B) Road Log from Las Cruces to Rincon Hills Rincon Hills Camp Rice组(上新世-下更新世)轴向河流沉积物中的自生蛋白石和方解石层:从Las Cruces到Rincon Hills的第三天(B)道路测井

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.39

G. Mack

引用次数: 0

Digital 3D geologic framework of the Las Cruces area 拉斯克鲁塞斯地区的数字三维地质框架

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.60

D. Sweetkind

引用次数: 0

Characterization and origin of episyenites in the southern Caballo Mountains, Sierra County, NM 新墨西哥州Sierra县Caballo山脉南部辉长岩的特征及成因

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.207

V. McLemore, A. Smith, A. M. Riggins, Dunbar N. Dunbar N., K. Frempong, M. Heizler

{"title":"Characterization and origin of episyenites in the southern Caballo Mountains, Sierra County, NM","authors":"V. McLemore, A. Smith, A. M. Riggins, Dunbar N. Dunbar N., K. Frempong, M. Heizler","doi":"10.56577/ffc-69.207","DOIUrl":"https://doi.org/10.56577/ffc-69.207","url":null,"abstract":"A bstrAct — Brick-red, K-feldspar-rich rocks, called episyenites (altered rocks that were desilicated and metasomatized by alkali-rich solu- tions) are found in several areas in southern and central New Mexico. These rocks contain anomalous concentrations of rare earth elements (REE, <2329 ppm), uranium (U, <9721 ppm), thorium (Th, <1378 ppm), niobium (Nb, <247 ppm) and high heavy REE (<133 ppm Yb and <179 ppm Dy). In the Caballo Mountains, the timing of metasomatism is older than late Cambrian as episyenite clasts occur in the Cambrian-Ordovician Bliss Formation that unconformably overlies episyenites and Proterozoic host rocks. 40 Ar/ 39 Ar dating of K-feldspars within the episyenites yields complex and intriguing age results that are likely related to multiple fluid-alteration events possibly during the Ancestral Rocky Mountains and Laramide orogenies. Rare U, Th, Nb, and REE minerals are found in the Caballo episyenites and could in- dicate potential REE mineralization at depth, including heavy REE. Synchysite is a major host of light REEs in the episyenites, while heavy REEs are concentrated predominantly in xenotime and priorite. Textural evidence and field relationships indicates that REE-bearing phases co-precipitated during metasomatism prior to deposition of the Cambrian-Ordovician Bliss Formation. The maximum age of the metasomatism forming the episyenites is between the age of the host granite (~1400 Ma) and the Bliss Formation (late Cambrian-early Ordovician). The K-feldspars in the episyenites were then re-heated during the Ancestral Rocky Mountains and Laramide orogenies.","PeriodicalId":253436,"journal":{"name":"Las Cruces Country III","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132229077","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: 2

Geologic evolution of southern New Mexico: Second-day road log from Las Cruces to the northwestern Do�a Ana Mountains and west-central Robledo Mountain 新墨西哥州南部的地质演化:从拉斯克鲁塞斯到西北部多阿纳山脉和中西部罗布雷多山脉的第二天道路日志

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.15

G. Mack, F. Ramos, B. Hampton, W. Seager, J. Witcher

引用次数: 0

A stable isotope record from paleosols and groundwater carbonate of the Plio-Pleistocene Camp Rice Formation, Hatch-Rincon Basin, southern New Mexico 新墨西哥州南部哈奇-林康盆地上新世-更新世坎普赖斯组古土壤和地下水碳酸盐的稳定同位素记录

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.109

A. Jochems, G. Morgan

{"title":"A stable isotope record from paleosols and groundwater carbonate of the Plio-Pleistocene Camp Rice Formation, Hatch-Rincon Basin, southern New Mexico","authors":"A. Jochems, G. Morgan","doi":"10.56577/ffc-69.109","DOIUrl":"https://doi.org/10.56577/ffc-69.109","url":null,"abstract":"A bstrAct — Stable oxygen and carbon isotope data from paleosols and shallow groundwater carbonates of the Plio-Pleistocene Camp Rice Formation in the western Hatch-Rincon Basin supplement an existing dataset from Neogene basin-fill in southern New Mexico and southeastern Arizona. In addition to their utility as proxies for paleoclimate and paleoenvironment, these data highlight local controls on the isotope chemistry of authigenic carbonate, such as depositional setting and hydrology. Oxygen isotope values for carbonates from Camp Rice piedmont deposits are higher on average (-6.8‰) than those from axial-fluvial parent material (-7.4‰), but mean carbon isotope values are identical (-4.3‰). The high carbon isotope values of soil carbonates formed in the ancestral Rio Grande floodplain differ from landscape mosaicism of C 3 versus C 4 plants observed in the Mangas Basin of southwestern New Mexico. This could be due to the influence of a shal- low and perhaps saline water table. Mean δ 18 O values increase from -7.6‰ for >3.1 Ma to -6.7‰ for <3.1 Ma samples and mean δ 13 C values increase from -4.9‰ to -3.8‰. Our data generally support a latest Pliocene-early Pleistocene transition to a warmer, drier climate with increased summer precipitation. This interpretation is consistent with stable isotope records from correlative deposits in the neighboring Palomas and eastern Hatch-Rincon Basins as well as southeastern Arizona.","PeriodicalId":253436,"journal":{"name":"Las Cruces Country III","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129134324","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

Cenozoic igneous activity in the Organ Mountains: Third�day (A) road log from Las Cruces to Dripping Springs Recreation Area, Organ Mountains 风琴山的新生代火成岩活动:从拉斯克鲁塞斯到风琴山滴泉游乐区的第三天(A)道路日志

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.31

F. Ramos, B. Hampton, W. Seager, G. Mack

引用次数: 0

Levees of the Hatch and Mesilla Valleys 哈奇和梅塞拉山谷的堤坝

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.63

A. Glover

引用次数: 0

Sr and Pb isotope variations of feldspars in the middle to late Eocene Palm Park Formation and Orejon Andesite: Implications for regional variability and magmatic source characteristics 始新世中晚棕榈园组和奥列岗安山岩长石Sr、Pb同位素变化:区域变异和岩浆源区特征

Las Cruces Country III Pub Date : 1900-01-01 DOI: 10.56577/ffc-69.181

F. Ramos, M. Jacobs, B. Hampton

引用次数: 5