{"title":"Prescribed Burn Impacts on Surface Water Quality and Quantity in the Upper Santa Fe Municipal Watershed: Baseline Data Ahead of Burns","authors":"Zachary M. Shephard, D. Cadol","doi":"10.56577/sm-2017.538","DOIUrl":"https://doi.org/10.56577/sm-2017.538","url":null,"abstract":"","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131390817","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}
We document a new chasmosaurine ceratopsid from the Upper Cretaceous Hall Lake Member of the McRae Formation, New Mexico. The chasmosaurine fossils consists of much of the skull, several vertebrae, ribs, and incomplete forelimbs. The fossils were collected from a red mudstone bed ~24 m above the base of the Hall Lake Member, south of McRae Canyon, Sierra County. Based on the occurrence of a tyrannosaur equivalent in body size to Tyrannosaurus rex and the sauropod Alamosaurus sanjuanensis , the Hall Lake Member is dated as Lancian (late Maastrichtian). The new chasmosaurine taxon is distinguished by a short but robust supraorbital horncore that is anteroposteriorly wide and mediolaterally compressed, premaxilla with a short pronounced ridge on the lateral surface, pterygoid with flat posteromedial ridge, robust jugal with pronounced posterolateral ridge, robust epijugal, and a long fenestrated frill with a strongly convex median parietal bar, and transversely narrow squamosal with a pointed end and elongate episquamosals. Cladistic analysis recoverses the McRae Formation chasmosaurine ceratopsian as a sister to Pentaceratops and places it within the Coahuilaceratops + Utahceratops clade based on the transversely narrow squamosal and the transversely expanded frill posteriorly. The discovery of the new taxon adds to the diversity of chasmosaurine ceratopsians during the final stage of the Late Cretaceous and to the poorly known dinosaur fauna of the McRae Formation.
{"title":"A New Chasmosaurine Ceratopsid From the Hall Lake Member of the Mcrae Formation (maastrichtian), South-Central New Mexico","authors":"S. Dalman, S. Lucas","doi":"10.56577/sm-2017.483","DOIUrl":"https://doi.org/10.56577/sm-2017.483","url":null,"abstract":"We document a new chasmosaurine ceratopsid from the Upper Cretaceous Hall Lake Member of the McRae Formation, New Mexico. The chasmosaurine fossils consists of much of the skull, several vertebrae, ribs, and incomplete forelimbs. The fossils were collected from a red mudstone bed ~24 m above the base of the Hall Lake Member, south of McRae Canyon, Sierra County. Based on the occurrence of a tyrannosaur equivalent in body size to Tyrannosaurus rex and the sauropod Alamosaurus sanjuanensis , the Hall Lake Member is dated as Lancian (late Maastrichtian). The new chasmosaurine taxon is distinguished by a short but robust supraorbital horncore that is anteroposteriorly wide and mediolaterally compressed, premaxilla with a short pronounced ridge on the lateral surface, pterygoid with flat posteromedial ridge, robust jugal with pronounced posterolateral ridge, robust epijugal, and a long fenestrated frill with a strongly convex median parietal bar, and transversely narrow squamosal with a pointed end and elongate episquamosals. Cladistic analysis recoverses the McRae Formation chasmosaurine ceratopsian as a sister to Pentaceratops and places it within the Coahuilaceratops + Utahceratops clade based on the transversely narrow squamosal and the transversely expanded frill posteriorly. The discovery of the new taxon adds to the diversity of chasmosaurine ceratopsians during the final stage of the Late Cretaceous and to the poorly known dinosaur fauna of the McRae Formation.","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115034443","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}
{"title":"Origin and Mineral Resource Potential of the Rosedale District, Socorro County, New Mexico","authors":"William Zutah, V. McLemore","doi":"10.56577/sm-2017.548","DOIUrl":"https://doi.org/10.56577/sm-2017.548","url":null,"abstract":"................................................................................................................................................... 2 ACKNOWLEDGEMENTS ............................................................................................................................ 3 CHAPTER ONE: INTRODUCTION ............................................................................................................. 9 Purpose of the Investigation ........................................................................................................................ 9 Location and Accessibility ........................................................................................................................ 10 Previous Investigations .............................................................................................................................. 11 Exploration and Mining History ................................................................................................................ 13 CHAPTER TWO: METHODS OF STUDY ................................................................................................. 19 Interpretation of Available Data ................................................................................................................ 19 Inventory of mine features, Mapping and Sampling ................................................................................. 19 Laboratory Analysis .................................................................................................................................. 19 Surface Model Interpretation ..................................................................................................................... 19 Comparison of Volcanic Epithermal Deposit ........................................................................................... 20 CHAPTER THREE: GEOLOGIC AND TECTONIC SETTING ................................................................ 2","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114678007","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}
{"title":"A Hydrogeochemical Analysis and Recharge Evaluation of Cienega Spring Located in the Sandia Mountains, New Mexico","authors":"Alexandra J. Minitrez, L. Crossey, C. McGibbon","doi":"10.56577/sm-2017.526","DOIUrl":"https://doi.org/10.56577/sm-2017.526","url":null,"abstract":"","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133886274","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}
Rhiannon E. Vieceli, S. Bilek, R. Aster, Lindsay Lowe-Worthington, B. Schmandt
{"title":"Using a New Temporary Seismic Network to Detect Earthquakes in the Socorro Magma Body Region","authors":"Rhiannon E. Vieceli, S. Bilek, R. Aster, Lindsay Lowe-Worthington, B. Schmandt","doi":"10.56577/sm-2017.509","DOIUrl":"https://doi.org/10.56577/sm-2017.509","url":null,"abstract":"","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125157728","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}
{"title":"Fossil Turtles of the Upper Cretaceous Mcrae Formation, Sierra County, New Mexico","authors":"Asher Lichtig, S. Lucas","doi":"10.56577/sm-2017.480","DOIUrl":"https://doi.org/10.56577/sm-2017.480","url":null,"abstract":"","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129232662","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}
D. Love, A. Rinehart, R. Chamberlin, Eda Celep, D. Koning
The southwestern part of the Albuquerque Basin of the Rio Grande rift between the Ladron Mountains and Rio Grande Valley is cut by three major and several lesser-known north-south normal faults with Quaternary offsets: Loma Pelada, Loma Blanca, and Cliff (from west to east). Each fault block exposes different sedimentary deposits ranging in age from mid-Miocene to early Quaternary. Deposits in the footwall of the west-down Cliff fault adjacent to the modern Rio Grande Valley consist of two kinds of southeast-directed channels and floodplain deposits of the ancestral Rio Puerco and Rio Salado and mixtures. The two channel types presumably joined the ancestral Rio Grande west of the Joyita Hills. The floodplain/basin-floor deposits are time- and in-part lithologically correlative with the broad fluvial fan of the Ceja Formation and Llano de Albuquerque to the north; they predate development of high-level terraces of the Rio Grande and modern west-east Rio Salado Valley to the south. Clasts are distinctive for the two types of stream channels, although locally some become mixed. Rio Puerco gravels commonly are well-rounded siliceous pebbles (at least 20 % chert) less than 8 cm long with a few larger pebbles; rare pebbles of 3.26-Ma Grants obsidian are present in upper exposures. Rio Salado clasts include larger, subangular-subrounded pebbles to boulders of limestone, sandstone, granite, quartzite, other Proterozoic metamorphic rocks, ash-flow tuffs, intermediate and basaltic volcanic rocks, and rare travertine. To determine the path(s) of the two channel types upstream from the exposures at the north end of the Cliff fault, we looked for similar suites of clasts between the Cliff and Loma Blanca faults and between the Loma Blanca and Loma Pelada faults. Northeast-directed Rio Salado deposits meet and overlie Rio Puerco deposits along the southern margins of the Rio Puerco Valley west of the Cliff fault and may be traced southwest to the east side of the Loma Blanca fault north of the Rio Salado Valley. Between the Loma Blanca and Loma Pelada faults, two possible levels of northeast-trending bluff-lines with Rio-Salado-type gravel deposits south of the bluffs suggest northeastward-directed paths toward the Rio Puerco. However, in the underlying deposits that clearly predate piedmont gravels shed from the Ladron Mountains, similar suites of “Rio Salado” clasts indicate northward transport. The transport direction shifts northeastward near AT&T road. North of AT&T road, clasts similar to the “Rio Salado” suite are directed southeast and probably were reworked from separate exposures northeast of the Ladron Mountains. Rio Puerco channels on both sides of the Loma Blanca fault are also directed southeast. We conclude that there may be several origins for clasts of the “Rio Salado suite” exposed in the footwall of the Cliff fault and that paleogeographic maps of fluvial contributors to deposits of the southern Albuquerque Basin may need revision.
位于Ladron Mountains和里约热内卢Grande Valley之间的里约热内卢Grande裂谷的Albuquerque盆地西南部被三条主要的和几个鲜为人知的具有第四纪断层的南北正断层切断:Loma Pelada, Loma Blanca和Cliff(自西向东)。各断块暴露出中中新世至早第四纪不同年龄的沉积矿床。与现代里约热内卢格兰德河谷相邻的西下断裂带下盘沉积由两种东南向的河道和祖先里约热内卢普尔科和里约热内卢萨拉多冲积平原沉积及其混合物组成。这两种类型的河道可能连接了乔伊塔山以西的原始里约热内卢Grande。河漫滩/盆地底沉积在时间和部分岩性上与盖哈组的宽河流扇和北部的阿尔布开克大平原具有相关性;它们早于里约热内卢Grande的高层梯田和南部的现代西-东里约热内卢Salado山谷的发展。碎屑在两种类型的河道中是不同的，尽管局部有些是混合的。普尔科砾石通常是圆润的硅质鹅卵石(至少20%是燧石)，长度小于8厘米，有少量较大的鹅卵石;上部露面有3.26 ma格兰特黑曜石的稀有卵石。里约热内卢萨拉多碎屑包括较大的亚角状卵石到石灰岩、砂岩、花岗岩、石英岩、其他元古代变质岩、灰流凝灰岩、中玄武质火山岩和稀有的钙华。为了确定克利夫断层北端暴露的上游两种通道类型的路径，我们在克利夫断层和洛马布兰卡断层之间以及洛马布兰卡断层和洛马佩拉达断层之间寻找了相似的碎屑组。向东北方向的bb0 Salado矿床与里约热内卢Puerco矿床在Cliff断裂以西里约热内卢Puerco山谷南缘相会并叠加在里约热内卢Puerco矿床之上，可向西南方向追溯至里约热内卢Salado山谷以北的Loma Blanca断层东侧。在洛马布兰卡断层和洛马佩拉达断层之间，两层可能的东北走向的断裂带和断裂带南部的里奥萨拉多型砾石沉积表明，通向里约热内卢Puerco的路径是东北方向的。然而，在明显早于Ladron山脉山前砾石脱落的下伏沉积物中，类似的里约热内卢Salado碎屑组表明北移。运输方向在AT&T路附近转向东北方向。在AT&T公路以北，类似于“里约热内卢Salado”套件的碎屑指向东南，可能是在Ladron山脉东北部的单独暴露中重新制作的。Loma Blanca断裂两侧的Puerco通道也向东南方向发育。我们的结论是，在克利夫断层下盘暴露的“里约热内卢萨拉多套件”碎屑可能有几个来源，并且阿尔伯克基盆地南部沉积物的河流贡献者的古地理图可能需要修订。
{"title":"Implications of Past Extents of Rio Salado and Rio Puerco Deposits in the Southwestern Corner of the Albuquerque Basin, New Mexico","authors":"D. Love, A. Rinehart, R. Chamberlin, Eda Celep, D. Koning","doi":"10.56577/sm-2017.535","DOIUrl":"https://doi.org/10.56577/sm-2017.535","url":null,"abstract":"The southwestern part of the Albuquerque Basin of the Rio Grande rift between the Ladron Mountains and Rio Grande Valley is cut by three major and several lesser-known north-south normal faults with Quaternary offsets: Loma Pelada, Loma Blanca, and Cliff (from west to east). Each fault block exposes different sedimentary deposits ranging in age from mid-Miocene to early Quaternary. Deposits in the footwall of the west-down Cliff fault adjacent to the modern Rio Grande Valley consist of two kinds of southeast-directed channels and floodplain deposits of the ancestral Rio Puerco and Rio Salado and mixtures. The two channel types presumably joined the ancestral Rio Grande west of the Joyita Hills. The floodplain/basin-floor deposits are time- and in-part lithologically correlative with the broad fluvial fan of the Ceja Formation and Llano de Albuquerque to the north; they predate development of high-level terraces of the Rio Grande and modern west-east Rio Salado Valley to the south. Clasts are distinctive for the two types of stream channels, although locally some become mixed. Rio Puerco gravels commonly are well-rounded siliceous pebbles (at least 20 % chert) less than 8 cm long with a few larger pebbles; rare pebbles of 3.26-Ma Grants obsidian are present in upper exposures. Rio Salado clasts include larger, subangular-subrounded pebbles to boulders of limestone, sandstone, granite, quartzite, other Proterozoic metamorphic rocks, ash-flow tuffs, intermediate and basaltic volcanic rocks, and rare travertine. To determine the path(s) of the two channel types upstream from the exposures at the north end of the Cliff fault, we looked for similar suites of clasts between the Cliff and Loma Blanca faults and between the Loma Blanca and Loma Pelada faults. Northeast-directed Rio Salado deposits meet and overlie Rio Puerco deposits along the southern margins of the Rio Puerco Valley west of the Cliff fault and may be traced southwest to the east side of the Loma Blanca fault north of the Rio Salado Valley. Between the Loma Blanca and Loma Pelada faults, two possible levels of northeast-trending bluff-lines with Rio-Salado-type gravel deposits south of the bluffs suggest northeastward-directed paths toward the Rio Puerco. However, in the underlying deposits that clearly predate piedmont gravels shed from the Ladron Mountains, similar suites of “Rio Salado” clasts indicate northward transport. The transport direction shifts northeastward near AT&T road. North of AT&T road, clasts similar to the “Rio Salado” suite are directed southeast and probably were reworked from separate exposures northeast of the Ladron Mountains. Rio Puerco channels on both sides of the Loma Blanca fault are also directed southeast. We conclude that there may be several origins for clasts of the “Rio Salado suite” exposed in the footwall of the Cliff fault and that paleogeographic maps of fluvial contributors to deposits of the southern Albuquerque Basin may need revision.","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114061642","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}
Rhyolite tuffs in the Mogollon-Datil volcanic field (MDVF; McIntosh et al., 1991;1992, hereafter M91, M92) and Boot Heel volcanic field (BHVF: McIntosh and Bryan, 2000) were previously correlated based on 40 Ar/ 39 Ar sanidine geochronology and paleomagnetism. For this project we revisited correlations between tuffs and inferred caldera sources for the time period 33.8–33.7 Ma, focusing on the “Box Canyon tuff” (M92). The southwestern MDVF contains exposures of several ~33.7 Ma tuffs, including Luna, Fall Canyon, Cherokee Canyon, “Kneeling Nun of Hedlund, 1978” (not actually Kneeling Nun), “Sugarlump,” Bell Top 6, and Box Canyon. These were grouped as the “Box Canyon tuff” at 33.73 ± 0.13 Ma (M92; formerly 33.51 Ma; all ages recalculated). Most samples were from outflow sheets, but the Cherokee Canyon tuff within the SMC was interpreted as caldera-fill and thus the SMC was inferred as the source of the “Box Canyon” tuffs. McIntosh and Bryan (2000) subsequently noted that the Oak Creek tuff, sourced from the Juniper caldera in the BHVF, also has an age of 33.72 Ma. Thus, there are two potential sources for the 33.7 “Box Canyon” tuff: the SMC and the Juniper caldera. We tested these correlations using electron microprobe analysis of sanidine. The two stratigraphically highest tuffs in the SMC, McCauley Ranch (33.99 Ma, this and Cherokee Canyon (33.84 Ma, this yielded average compositions of Or 43 and Or 55 , whereas the Oak Creek (33.72 ± 0.07 Ma, McIntosh and Bryan, 2000), “Kneeling Nun of Hedlund, 1978” (33.8 Ma, M91), and Bell Top 6 (33.8 Ma M91) tuffs have sanidine compositions in a cluster around Or 65 . The Oak Creek tuff from the Juniper caldera has sanidine more geochemically similar to other “Box Canyon” tuffs than to the Cherokee Canyon tuff of the SMC, and therefore the SMC is not the exclusive source for the “Box Canyon tuff”. Future work will characterize the other “Box Canyon” tuffs to determine if they represent outflow sheets from the SMC. One potential area is Knight’s Peak, 20 km south of the SMC. There, the JPB Mountain tuff is 36.3 ± 0.6 Ma (U-Pb zircon). The overlying C-Bar Canyon rhyolite tuff did not yield sanidine. The overlying “Kneeling Nun of Hedlund, 1978” is 33.77 Ma (M91) and thus cannot be Kneeling Nun (~35 Ma). This is overlain by the intermediate lava flows of Malpais Hills that yielded a U-Pb age of 32.6 ± 0.4 Ma. The unrecalculated age of 33.51 Ma (M92) has been long used as the “age” of the SMC (e.g., Chapin et al., 2004). Continuing work on the SMC will determine the age of the caldera collapse and caldera fill deposits.
mogolon - datil火山区流纹岩凝灰岩McIntosh et al.， 1991;1992，以下简称M91, M92)和Boot Heel火山场(BHVF: McIntosh and Bryan, 2000)之前基于40 Ar/ 39 Ar的岩浆年代学和古地磁进行了对比。在这个项目中，我们重新研究了33.8-33.7 Ma期间凝灰岩与推断出的火山口来源之间的相关性，重点关注“Box Canyon凝灰岩”(M92)。西南MDVF包含几个~33.7 Ma凝灰岩的暴露，包括Luna, Fall Canyon, Cherokee Canyon，“Hedlund的跪尼姑，1978”(不是真正的跪尼姑)，“Sugarlump”，Bell Top 6和Box Canyon。在33.73±0.13 Ma (M92;原为33.51 Ma;所有年龄重新计算)。大多数样品来自流出层，但SMC内的切诺基峡谷凝灰岩被解释为火山口填充物，因此SMC被推断为“盒子峡谷”凝灰岩的来源。McIntosh和Bryan(2000)随后指出，来自BHVF的Juniper破火山口的Oak Creek凝灰岩的年龄也为33.72 Ma。因此，33.7“盒子峡谷”凝灰岩有两个潜在的来源:SMC和Juniper破火山口。我们用电子探针分析了这些相关性。SMC中两个地层最高的凝灰岩，McCauley Ranch (33.99 Ma)和Cherokee Canyon (33.84 Ma)的平均组成为Or 43和Or 55，而Oak Creek(33.72±0.07 Ma, McIntosh和Bryan, 2000)，“hehedlund跪尼玛，1978”(33.8 Ma, M91)和Bell Top 6 (33.8 Ma M91)凝灰岩的平均组成在Or 65附近。来自Juniper破火山口的Oak Creek凝灰岩的地球化学特征与其他“Box Canyon”凝灰岩相似，而与SMC的Cherokee Canyon凝灰岩相似，因此SMC不是“Box Canyon”凝灰岩的唯一来源。未来的工作将描述其他“盒状峡谷”凝灰岩，以确定它们是否代表SMC的流出层。一个潜在的区域是位于SMC以南20公里的骑士峰。其中，JPB山凝灰岩为36.3±0.6 Ma (U-Pb锆石)。上覆的C-Bar峡谷流纹岩凝灰岩不产毒碱。上面的“赫隆德下跪的尼姑，1978”是33.77 Ma (M91)，因此不可能是下跪的尼姑(~35 Ma)。它被马尔佩斯山的中间熔岩流覆盖，产生了32.6±0.4 Ma的U-Pb年龄。未重新计算的33.51 Ma (M92)的年龄一直被用作SMC的“年龄”(如Chapin et al.， 2004)。对SMC的持续研究将确定破火山口崩塌和破火山口填充物沉积的年龄。
{"title":"The “Box Canyon tuff” and its Relationship to the Schoolhouse Mountain Caldera, Mogollon-Datil Volcanic Field, Southwest New Mexico","authors":"J. Amato, V. Swenton, W. Mcintosh, T. Jonell","doi":"10.56577/sm-2017.539","DOIUrl":"https://doi.org/10.56577/sm-2017.539","url":null,"abstract":"Rhyolite tuffs in the Mogollon-Datil volcanic field (MDVF; McIntosh et al., 1991;1992, hereafter M91, M92) and Boot Heel volcanic field (BHVF: McIntosh and Bryan, 2000) were previously correlated based on 40 Ar/ 39 Ar sanidine geochronology and paleomagnetism. For this project we revisited correlations between tuffs and inferred caldera sources for the time period 33.8–33.7 Ma, focusing on the “Box Canyon tuff” (M92). The southwestern MDVF contains exposures of several ~33.7 Ma tuffs, including Luna, Fall Canyon, Cherokee Canyon, “Kneeling Nun of Hedlund, 1978” (not actually Kneeling Nun), “Sugarlump,” Bell Top 6, and Box Canyon. These were grouped as the “Box Canyon tuff” at 33.73 ± 0.13 Ma (M92; formerly 33.51 Ma; all ages recalculated). Most samples were from outflow sheets, but the Cherokee Canyon tuff within the SMC was interpreted as caldera-fill and thus the SMC was inferred as the source of the “Box Canyon” tuffs. McIntosh and Bryan (2000) subsequently noted that the Oak Creek tuff, sourced from the Juniper caldera in the BHVF, also has an age of 33.72 Ma. Thus, there are two potential sources for the 33.7 “Box Canyon” tuff: the SMC and the Juniper caldera. We tested these correlations using electron microprobe analysis of sanidine. The two stratigraphically highest tuffs in the SMC, McCauley Ranch (33.99 Ma, this and Cherokee Canyon (33.84 Ma, this yielded average compositions of Or 43 and Or 55 , whereas the Oak Creek (33.72 ± 0.07 Ma, McIntosh and Bryan, 2000), “Kneeling Nun of Hedlund, 1978” (33.8 Ma, M91), and Bell Top 6 (33.8 Ma M91) tuffs have sanidine compositions in a cluster around Or 65 . The Oak Creek tuff from the Juniper caldera has sanidine more geochemically similar to other “Box Canyon” tuffs than to the Cherokee Canyon tuff of the SMC, and therefore the SMC is not the exclusive source for the “Box Canyon tuff”. Future work will characterize the other “Box Canyon” tuffs to determine if they represent outflow sheets from the SMC. One potential area is Knight’s Peak, 20 km south of the SMC. There, the JPB Mountain tuff is 36.3 ± 0.6 Ma (U-Pb zircon). The overlying C-Bar Canyon rhyolite tuff did not yield sanidine. The overlying “Kneeling Nun of Hedlund, 1978” is 33.77 Ma (M91) and thus cannot be Kneeling Nun (~35 Ma). This is overlain by the intermediate lava flows of Malpais Hills that yielded a U-Pb age of 32.6 ± 0.4 Ma. The unrecalculated age of 33.51 Ma (M92) has been long used as the “age” of the SMC (e.g., Chapin et al., 2004). Continuing work on the SMC will determine the age of the caldera collapse and caldera fill deposits.","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116589187","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}
{"title":"An Abandoned Uranium Mine Survey of Mine Sites in New Mexico","authors":"Annelia Tinklenberg, R. Sengebush","doi":"10.56577/sm-2017.505","DOIUrl":"https://doi.org/10.56577/sm-2017.505","url":null,"abstract":"","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123397222","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}
{"title":"Sedimentology, Stratigraphy, and Geochronology From Early(?)–Middle Eocene, Post-Laramide Volcanic and Volcaniclastic Strata of the Palm Park Formation in South-Central New Mexico","authors":"R. H. Creitz, B. Hampton, G. Mack, J. Amato","doi":"10.56577/sm-2017.518","DOIUrl":"https://doi.org/10.56577/sm-2017.518","url":null,"abstract":"","PeriodicalId":192881,"journal":{"name":"Proceedings Volume: \"Uranium in New Mexico: the Resource and the Legacy\", New Mexico Geological Society, 2017 Annual Spring Meeting","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127544913","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}
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