Mountain Geologist最新文献_第8页

Stratigraphy and Tectonic Significance of the Tunp Conglomerate in the Fossil Basin, Southwest, Wyoming 怀俄明州西南部化石盆地Tunp砾岩的地层学及构造意义

Mountain Geologist Pub Date : 1986-01-01 DOI: 10.31582/rmag.mg.23.1.6

D. Hurst, J. Steidtmann

{"title":"Stratigraphy and Tectonic Significance of the Tunp Conglomerate in the Fossil Basin, Southwest, Wyoming","authors":"D. Hurst, J. Steidtmann","doi":"10.31582/rmag.mg.23.1.6","DOIUrl":"https://doi.org/10.31582/rmag.mg.23.1.6","url":null,"abstract":"The Tunp Member of the Wasatch Formation in the Fossil basin of southwestern Wyoming was deposited by debris flows containing abundant, very poorly sorted to unsorted coarse debris in a mudstone matrix. Deposition occured on alluvial fans where small braided streams reworked the toes of the debris flows generating minor fluvial deposits. Tunp sediments are preserved in three separate north-south trending belts adjacent to the northern Fossil basin and deposits in each belt had separate sources in discrete highlands. The Tunp on Commissary Ridge was generated by passive uplift of the Absaroka sheet over a ramp in the Darby thrust. The deposits on Rock Creek and Dempsey ridges are related to motion on the Tunp thrust. The Tunp on Boulder Ridge was derived from the hanging wall of the Crawford thrust but it is not clear whether this was a passive or active source. Stratigraphic relations of these Tunp deposits with dated beds in the Wasatch and Green River formations indicate that the belts of Tunp are successively older to the west and that passive rotation of the Absaroka sheet preceded movement on the Tunp thrust which, in turn, preceded the generation of a source on the Crawford. Deposition of the Tunp therefore records a sequence, progressively younger to the west, of minor adjustments to compression during the last phase of thrusting.","PeriodicalId":101513,"journal":{"name":"Mountain Geologist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116875880","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: 8

The 14 August 1983 Cimarron, Colorado Earthquake and the Cimarron Fault 1983年8月14日的科罗拉多西马伦地震和西马伦断层

Mountain Geologist Pub Date : 1986-01-01 DOI: 10.31582/rmag.mg.23.1.14

I. Wong, J. Humphrey

引用次数: 1

A Case for Brittle Deformation of the Basement During the Laramide Revolution in the Rocky Mountain Foreland Province 落基山前陆省拉腊米革命期间基底脆性变形的一个实例

Mountain Geologist Pub Date : 1986-01-01 DOI: 10.31582/rmag.mg.23.1.1

V. Matthews

引用次数: 5

Eocene-Pliocene Stratigraphy Along the Southern Margin of the Wind River Range, Wyoming: Revisions and Implications from Field and Fission-Track Studies 怀俄明风河南缘始新世-上新世地层学:野外和裂变径迹研究的修正和意义

Mountain Geologist Pub Date : 1986-01-01 DOI: 10.31582/rmag.mg.23.1.19

J. Steidtmann, L. Middleton

{"title":"Eocene-Pliocene Stratigraphy Along the Southern Margin of the Wind River Range, Wyoming: Revisions and Implications from Field and Fission-Track Studies","authors":"J. Steidtmann, L. Middleton","doi":"10.31582/rmag.mg.23.1.19","DOIUrl":"https://doi.org/10.31582/rmag.mg.23.1.19","url":null,"abstract":"The established mid-Tertiary stratigraphy along the southern margin of the Wind River Range is of questionable chronologic validity because of the difficulty in discriminating among the several tuffaceous units and because lithologic criteria have been used as chronostratigraphic indicators. Field observations and zircon fission-track ages suggest certain revisions of, and additions to, this stratigraphy. These include: 1) recognition of the Cathedral Bluffs Tongue of the Wasatch Formation at Reds Cabin monocline, 2) establishment of a late Oligocene or early Miocene age for the South Pass Formation and 3) recognition that there are middle Miocene deposits previously mapped as Arikaree that consist of reworked Arikaree shed off the upthrown side of the Continental fault. The implications of these findings are that the Continental fault, now a collapse feature, was a tear fault during the early Eocene, that there are most likely Oligocene rocks north of the Continental fault, that there was late Oligocene or early Miocene uplift in the core of the Wind River Range and that the range collapsed in the middle Miocene.","PeriodicalId":101513,"journal":{"name":"Mountain Geologist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134309018","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: 7

San Juan Sag: Cretaceous Rocks in a Volcanic-Covered Basin, South Central Colorado 圣胡安凹陷:科罗拉多州中南部火山覆盖盆地中的白垩纪岩石

Mountain Geologist Pub Date : 1985-10-01 DOI: 10.31582/rmag.mg.22.4.167

R. Gries

引用次数: 15

Tectonic and Sedimentation Model For Morrow Sandstone Deposition, Sorrento Field Area Denver Basin, Colorado 科罗拉多州丹佛盆地索伦托油田莫罗砂岩沉积构造与沉积模式

Mountain Geologist Pub Date : 1985-10-01 DOI: 10.1306/AD462A9C-16F7-11D7-8645000102C1865D

S. Sonnenberg

{"title":"Tectonic and Sedimentation Model For Morrow Sandstone Deposition, Sorrento Field Area Denver Basin, Colorado","authors":"S. Sonnenberg","doi":"10.1306/AD462A9C-16F7-11D7-8645000102C1865D","DOIUrl":"https://doi.org/10.1306/AD462A9C-16F7-11D7-8645000102C1865D","url":null,"abstract":"Pennsylvanian Morrow sandstones are oil and gas productive throughout a large area in southeast Colorado. The Sorrento field is a recent major Morrow discovery with recoverable reserves estimated at over 10 million barrels of oil from an area of 3200 acres (1295 ha) at depths of 5400 to 5600 ft (1646 to 1707 m). Minor production also occurs from the Mississippian Spergen Formation, the Mississippian Saint Louis Formation, and the Pennsylvanian Marmaton Group. On the basis of subsurface mapping, productive Morrow sandstones are interpreted to be fluvial valley-fill deposits, consisting mainly at channel sandstones. These deposits are encased in marine shale and range in thickness from O to 55 ft (O to 16.7 m); net pay ranges from 5 to 30 ft (1.5 to 9.1 m). Porosities average 19% and permeabilities range from 1 to 4000 md. Isopach maps of the Morrow and associated stratigraphic intervals indicate that paleostructure influenced Morrow depositional patterns. Morrow channel sandstones accumulated in paleostructural low areas created by movements on basement fault blocks. Structural nosing is present in the same location and trend as the Morrow channels, indicating structural inversion. Analyses of stratigraphic intervals above the Morrow indicate that the structural inversion occurred during the Early and Middle Pennsylvanian. The field is regarded as a combination structural-stratigraphic trap. Knowledge of paleostructural control on reservoir facies provides a new idea for exploration for Morrow reservoirs in southeast Colorado.","PeriodicalId":101513,"journal":{"name":"Mountain Geologist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121064841","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: 13

The Permian-Triassic Stratigraphy of the Northwest Paradox Basin Area, Emery, Garfield, and Wayne Counties, Utah 犹他州埃默里、加菲尔德和韦恩县西北悖论盆地地区的二叠纪-三叠纪地层

Mountain Geologist Pub Date : 1985-10-01 DOI: 10.31582/rmag.mg.22.4.149

G. Mitchell

{"title":"The Permian-Triassic Stratigraphy of the Northwest Paradox Basin Area, Emery, Garfield, and Wayne Counties, Utah","authors":"G. Mitchell","doi":"10.31582/rmag.mg.22.4.149","DOIUrl":"https://doi.org/10.31582/rmag.mg.22.4.149","url":null,"abstract":"The Upper Permian and Lower Triassic rocks in the northwestern Paradox basin are closely related even though they are separated by a significant unconformity. Careful analysis of surface and subsurface data provides a framework to relate underlying units to deposition of suprajacent units. The Black Dragon Member of the Triassic Moenkopi Formation infilled the topography on the underlying Permian units. The thickness of the Black Dragon Member is inversely related to the thickness of the underlying White Rim Sandstone. The upper portion of the Black Dragon Member was deposited primarily in coastal marine environments with a very low westward depositional slope. An oolite-bearing carbonate shelf present during subsequent Sinbad Member deposition was also controlled, in part, by thickness distribution of the Permian White Rim Sandstone. The Torrey Member was deposited on the Sinbad Member in a fine-grained, elastic-dominated, low energy, very flat coastal environment. The Moody Canyon Member (uppermost Moenkopi) was deposited in a subaqueous environment, probably marine. The Emery uplift, a pre-White rim tectonic element, did not affect deposition of the White Rim, Kaibab or Moenkopi strata. The San Rafael Swell is a Laramide tectonic feature that is offset from and unrelated to the Emery uplift or deposition of the Permian and Triassic units.","PeriodicalId":101513,"journal":{"name":"Mountain Geologist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130099792","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

Drainage Development of the Green River Basin In Southwestern Wyoming and its Bearing on Fish Biogeography, Neotectonics, and Paleoclimates 怀俄明州西南部绿河流域的排水发展及其对鱼类生物地理、新构造和古气候的影响

Mountain Geologist Pub Date : 1985-10-01 DOI: 10.31582/rmag.mg.22.4.192

W. Hansen

{"title":"Drainage Development of the Green River Basin In Southwestern Wyoming and its Bearing on Fish Biogeography, Neotectonics, and Paleoclimates","authors":"W. Hansen","doi":"10.31582/rmag.mg.22.4.192","DOIUrl":"https://doi.org/10.31582/rmag.mg.22.4.192","url":null,"abstract":"The Upper Green River flows southward out of the Green River Basin through a series of deep canyons across the Uinta Mountains in a course that post-dates the deposition of the Bishop Conglomerate (Oligocene); the ancestral Green flowed east to the Mississippi, probably by way of the North Platte. Basinal subsidence in Eocene time had produced 3 large, well-known, interconnected lakes on both sides of the Uinta Mountains--Fossil Lake and Lake Gosiute on the north side and Lake Uinta on the south. Lake-to-lake connections are indicated by a remarkably well preserved fauna common to all three lakes, the famous Green River fish fauna. Most of these fish had Mississippi River affinities, hence, the Continental Divide in Eocene time was west of the lakes. The Colorado River system did not yet exist. After the lakes disappeared, drainage was generally eastward across the present Continental Divide, until the Green River was captured near Green River, Wyo. by south-flowing drainage in middle Pleistocene time, ca., 600,000 years ago. Capture of the Upper Green River as recently as middle Pleistocene time, if a valid hypothesis, must take into account the marked differences between the endemic and indigenous fish fauna of the Green River and that of the North Platte. The Green is postulated to have been captured at the height of a glacial stage when the Green River Basin was a frigid semidesert and its fish population had been forced far downstream by the hostility of the glacial climate. Indigenous nonendemic cold-water fauna of the Green River/Upper Colorado River Basin - salmonids, cottids, and others - are geologically recent arrivals from the Columbia River Basin; they probably transferred to the Green during an interglacial stage, then spread throughout the Upper Colorado River system during the colder water phase of a succeeding glacial stage. Several possible transfer points exist along the Green/Bear and Green/Snake River divides.","PeriodicalId":101513,"journal":{"name":"Mountain Geologist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127190882","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: 17

Late Pleistocene Glaciation of Pikes Peak, Colorado 科罗拉多州派克峰的晚更新世冰期

Mountain Geologist Pub Date : 1985-07-01 DOI: 10.31582/rmag.mg.22.3.139

T. Huber, P. Grogger

引用次数: 1

Sedimentology and Depositional Environments of the Emery Sandstone Member of the Mancos Shale, Emery and Sevier Counties, Utah 犹他州埃默里和塞维尔县Mancos页岩中埃默里砂岩段的沉积学和沉积环境

Mountain Geologist Pub Date : 1985-07-01 DOI: 10.31582/rmag.mg.22.3.94

J. P. Matheny, M. Picard

{"title":"Sedimentology and Depositional Environments of the Emery Sandstone Member of the Mancos Shale, Emery and Sevier Counties, Utah","authors":"J. P. Matheny, M. Picard","doi":"10.31582/rmag.mg.22.3.94","DOIUrl":"https://doi.org/10.31582/rmag.mg.22.3.94","url":null,"abstract":"Results of a sedimentological study of the Emery Sandstone Member of the Mancos Shale (Upper Cre- taceous) in southern Castle Valley, Utah, are presented. Depositional environments, paleogeography, textural and mineralogrcal characteristics and possible sediment sources are determined. Tidal flat deposits are dominant in the Emery, but subtidal (shoreface) and offshore deposits also occur. The paleotidal range is estimated to have been between 1 3 and 1.7 m Many asymmetrrc, transgressive-regres- srve cycles of two drfferent magnitudes and periods are present. They formed in response to minor fluctua-tions in sea level combrned wrth slight varrations m the subsidence rate. The Emery Sandstone was deposited m the foreland of the Sevier orogenic belt. The average orientatron of the paleoshoreline, as determrned by paleocurrent analysis, was N. 9\" W. Sediment was probably transported southward from the Utah-Idaho- Wyomrng border area by longshore currents. Well-sorted, subrounded to subangular, very fme-grained subarkose is the dominant rock type in the Emery Dolomite and calcrte are the major cements Average porositres, based on thin sectron analysis, are less than 2 percent. Abundant chert grains and reworked authigenrc quartz overgrowths suggest a sedimentary source terrain. The observed amounts of feldspar could have been derived from Mesozorc sedimentary rocks exposed in the Sevier orogenrc belt","PeriodicalId":101513,"journal":{"name":"Mountain Geologist","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133499241","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: 9