New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: "Rocks of New Mexico and Adjacent States"最新文献

{"title":"U-PB AGES OF DETRITAL ZIRCONS FROM THE OLIGOCENE CHUSKA SANDSTONE (ARIZONA–NEW MEXICO): IMPLICATIONS FOR SAND PROVENANCE","authors":"W. Dickinson, S. Cather, G. Gehrels","doi":"10.56577/sm-2009.817","DOIUrl":"https://doi.org/10.56577/sm-2009.817","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123681862","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":"TEPEE-LIKE STRUCTURES IN THE MIDDLE JURASSIC TODILTO FORMATION, WESTCENTRAL NEW MEXICO","authors":"W. Berglof, K. Krainer, S. Lucas","doi":"10.56577/sm-2009.667","DOIUrl":"https://doi.org/10.56577/sm-2009.667","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122139295","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":"PALEOMAGNETISM OF ROCK STRATA ADJACENT TO THE CRETACEOUSTERTIARY INTERFACE IN THE SAN JUAN BASIN, NEW MEXICO AND COLORADO","authors":"J. Fassett","doi":"10.56577/sm-2009.822","DOIUrl":"https://doi.org/10.56577/sm-2009.822","url":null,"abstract":"Multiple paleomagnetic sections have been obtained through rock strata adjacent to the CretaceousTertiary (K-T) interface in the San Juan Basin in New Mexico and Colorado. Paleomagnetic studies of uppermost Cretaceous strata in the southern San Juan Basin have revealed the presence of an interval of reversed-polarity in the Kirtland and Fruitland Formations immediately beneath the K-T interface and an interval of normal polarity of undetermined length in underlying Cretaceous strata. (These polarity intervals were incorrectly assigned to magnetochrons C30r and C31n by some previous authors.) Subsequently, 40 Ar/ 39 Ar ages for sanidine crystals from eight altered volcanic ash beds in this same stratigraphic interval revealed that these two magnetochrons were unequivocally C32r and C33n. Because two ash-bed ages were above the magnetochron reversal and six were below, the age of the reversal was precisely determined to be 73.50 ± 0.19 Ma, thus establishing a new precise Upper Cretaceous tie-point for global geologic time scales. A magnetic-polarity section obtained in the northeast part of the San Juan Basin in Colorado (the Chimney Rock section) through the upper part of the Lewis Shale, Pictured Cliffs Sandstone, and lowermost Fruitland Formation also located magnetochrons C33n and C32r. A 40 Ar/ 39 Ar age for an ash bed in this section confirmed the identity of these magnetochrons. A cross section across the basin from southwest to northeast shows that the C32rC33n reversal exactly parallels the Huerfanito Bentonite Bed present 335 m below in the underlying Lewis Shale indicating that there was no differential tectonism resulting in erosion or non-deposition of strata between these two geochrons in the San Juan Basin. Magnetic-polarity studies of the Paleocene Ojo Alamo Sandstone reveal that there is a thin, reversedpolarity interval in the lowermost part of this formation overlain by a relatively thin normalpolarity interval overlain by a thin reversed-polarity interval (all within the Ojo Alamo Sandstone), overlain by a longer normal interval extending into the lower part of the overlying Nacimiento Formation. On the basis of palynology, vertebrate paleontology, and physical geology the magneticpolarity intervals in the Ojo Alamo Sandstone can be confidently labeled magnetochrons C29r and subchrons C29n.2n, C29n.1r, and C29n.1n. Thus, not only is all of the Ojo Alamo Sandstone Paleocene in age; these data also indicate that approximately 0.3 m.y. of lowermost Paleocene time is not represented by rock strata in the southern San Juan Basin. Because the age of the highest Cretaceous ash bed, about 5 m below the base of the Ojo Alamo and the K-T interface is 73.04 Ma, the duration of the K-T hiatus in the southern San Juan Basin is estimated to be 7.84 m.y. (73.04 – 65.2 = 7.84).","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129792698","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":"VERTEBRATE BIOCHRONOLOGY OF THE CRETACEOUS-PALEOCENE TRANSITION, SAN JUAN BASIN, NEW MEXICO","authors":"S. Lucas, R. M. Sullivan","doi":"10.56577/sm-2009.839","DOIUrl":"https://doi.org/10.56577/sm-2009.839","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130181846","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":"BASIN-FILL ARCHITECTURE OF PLIOCENELOWER PLEISTOCENE ALLUVIAL-FAN AND AXIAL-FLUVIAL STRATA ADJACENT TO THE MUD SPRINGS MOUNTAINS, PALOMAS BASIN, SOUTHERN RIO GRANDE RIFT","authors":"R. Foster, G. Mack","doi":"10.56577/sm-2009.826","DOIUrl":"https://doi.org/10.56577/sm-2009.826","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127688082","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":"MULTIPLE EPISODES OF FAULTING IN THE CENTRAL FLORIDA MOUNTAINS, LUNA COUNTY, NEW MEXICO","authors":"T. Lawton, J. R. Andrie, T. Avant, R. M. Bright, J. S. Causey, C. Durr, M. Durr, T. H. Hearon, R. A. Kernan IV, P. Montoya","doi":"10.56577/sm-2009.833","DOIUrl":"https://doi.org/10.56577/sm-2009.833","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133747222","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":"GEO AND THERMOCHRONOLOGICAL EVIDENCE FOR THE EMPLACEMENT AND EXHUMATIONAL HISTORY OF THE TWIN LAKES BATHOLITH: IMPLICATIONS FOR THE LARAMIDE OROGENY","authors":"Josh Feldman, M. Heizler, S. Kelley, K. Karlstrom, G. Gehrels","doi":"10.56577/sm-2009.824","DOIUrl":"https://doi.org/10.56577/sm-2009.824","url":null,"abstract":"New geo and thermochronological data from the Twin lakes pluton 20 miles south of Leadville, CO reveals a complex intrusion history followed by protracted exhumation. These results have important regional implications for the Laramide orogeny, Colorado Mineral Belt (COMB) plutonism, central CO exhumation, and possible links to a present-day zone of low velocity upper mantle know as the Aspen Anomaly. LA-ICPMS U/Pb zircon data show that the Twin Lakes pluton is composite with at least four intrusions of ~63, 57, 43 and 40 Ma. A fifth 36 Ma intrusion is indicated by argon mica ages. K-feldspar argon and apatite fission track (AFT) thermochronology constrain the post emplacement thermal history. K-feldspar minimum ages along a vertical transect near Huron Peak young from 36 to 31 Ma over 1.2 km of elevation. Assuming uniform exhumation, the average denudation rate for this period was ~250 m/Ma. This rate is apparently maintained until ca. 20 Ma based on AFT ages near the Twin Lakes reservoir. Assuming a 30° C/km geothermal gradient and a K-feldspar closure temperature of 175° C a paleodepth of 5.5 km at 31 Ma is estimated for the base of Huron Peak. plutonic activity is hosted in the Twin Lakes pluton, thus its seems unlikely that magmatism accurately depicts the leading edge of the slab at any given time. These new data are more consistent with the idea that the COMB magmatism reflects a longlived zone of fertility and/ or pluton conduit throughout the early Tertiary. The data may also suggest that the Aspen Anomaly contributed to continuous CO magmatism from ~70 Ma to the present. In addition to tectonic implications, the data show that existing compilations based on argon and zircon fission track ages are inaccurate representations of COMB magmatism as both systems are unable to resolve complexities of closely spaced multiple magma injections.","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128421445","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 NEW GIGANTIC PYCNODONT FISH FROM THE UPPER CRETACEOUS JUANA LOPEZ MEMBER, MANCOS SHALE OF NEW MEXICO","authors":"T. Williamson, K. Shimada, K. Shimada, P. Sealey","doi":"10.56577/sm-2009.855","DOIUrl":"https://doi.org/10.56577/sm-2009.855","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123843187","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":"USE OF COMPOSITIONAL ANALYSES OF OBSIDIAN ARTIFACTS IN UNDERSTANDING THE OCCUPATION HISTORY OF PUEBLO INDIANS IN THE CAÑADA ALAMOSA AREA, SOCORRO COUNTY, NEW MEXICO","authors":"J. Ferguson, V. McLemore, K. Laumbach","doi":"10.56577/sm-2009.825","DOIUrl":"https://doi.org/10.56577/sm-2009.825","url":null,"abstract":"","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129309697","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":"SELACHIAN-DOMINATED VERTEBRATE FOSSIL ASSEMBLAGE FROM THE UPPER CRETACEOUS ATARQUE SANDSTONE, SEVILLETTA NATIONAL WILDLIFE REFUGE, SOCORRO COUNTY, NEW MEXICO","authors":"R. Pence, S. Lucas, J. Spielmann","doi":"10.56577/sm-2009.847","DOIUrl":"https://doi.org/10.56577/sm-2009.847","url":null,"abstract":"We have relocated and recollected the fossil vertebrate locality in the Upper Cretaceous (Turonian) Atarque Sandstone on the Sevilleta National Wildlife Refuge first documented by Baker and Wolberg in the 1980s. The locality is now NMMNH 5153 and yields numerous teeth and bone fragments from a 0.7-m-thick localized intrabasinal ferruginous conglomerate of limestone, tooth, bone, bivalve shell and chert pebbles in a section of finegrained sandstone near the top of the Atarque Sandstone. Virtually all of the teeth and bones from this bed were broken prior to fossilization, so based on the lithjology of the bonebed and the preservation of the fossils, we interpret this fossil site as an allochthonous assemblage in a storm deposit. The following selachian taxa were previously known to be present in this assemblage: Hybodus sp., Ptychodus whipplei , P . cf. P . mammillaris , Chiloscyllium greeni , Scapanorhynchus raphiodon, Cretodus semiplicatus , cf. Paranomodon sp., Squalicorax falcatus, Rhinobatos sp., Pseudohypolophus mcnultyi, Ischyrhiza schneideri and Ptychotrygon triangularis . Our collection duplicates many of the selachian taxa previously known from this assemblage, and also includes numerous teleost, especially pycnodonts. Turtle bones and dromaeosaur teeth are also present, indicating a freshwater/terrestrial component to the assemblage. Scapanorhynchus dominates the assemblage, and the sedimentology, terrestrial taxa, assemblage diversity and rarity of Ptychodus suggest a relatively nearshore association.","PeriodicalId":205982,"journal":{"name":"New Mexico Geological Society, 2009 Annual Spring Meeting, Proceedings Volume, Theme: \"Rocks of New Mexico and Adjacent States\"","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128680728","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}