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Suggested revisions to the Tertiary tectonic history of north-central New Mexico 建议修正新墨西哥中北部第三纪构造史
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.109
S. Cather
Based on a variety of new or re-evaluated geo logica l and geophysical constraints , the following modifications to the Teniary tecton ic history of nonh-ccntral New Mexico are proposed: ( I) reverse faulting along the Pajarito fault zone defined the western boundary of a late Laramide base ment uplift (Pajarito uplift) that was contiguous with the Sangre de Cristo uplift to the east; (2) the Tijeras fault zone constitu ted a re leasing bend in the right-lateral strike-slip system of the Laramide southern Roc ky Mountains and controlled extensional subsidence within an Eocene half-graben to the nonhwest (the Gali,teo basin): (3) development of a flexural hi nge along a Laramide precursor to the Santa Ana accommodat ion zone (new name) may have faci litated the southeastward tilting of the floor of the Galisteo basin and locally delineated the sou thern boundary of the Pajarito uplift; and (4 ) the Pajari to uplift began to collapse due to extension beginning in the late Oligoceneearly Miocene, and continued subsidence and westward tilting of the resulting Espanola half-graben caused deposition of about 3 km of Santa Fe Group sediments near the Pajarito fault zone .
基于各种新的或重新评估的地质和地球物理约束条件,对新墨西哥州非中部地区的第三纪构造史进行了以下修正:(1)沿Pajarito断裂带的逆断裂确定了晚Laramide基底隆起(Pajarito隆起)的西部边界,该隆起东部与Sangre de Cristo隆起相邻;(2) Tijeras断裂带在罗克天山南缘Laramide右旋走滑体系中形成了一个大弯曲,控制了西北缘始新世半地堑(Gali,teo盆地)内的伸展沉降;(3)沿着圣安娜适应带(新名称)的Laramide前体发育的弯曲断层可能促进了加里斯托盆地底部的东南倾斜,并在局部划定了帕加里托隆起的南部边界;(4)从渐新世晚期至中新世早期开始,帕加里托隆起因伸展而开始崩塌,由此形成的Espanola半地堑持续沉降和向西倾斜,在帕加里托断裂带附近沉积了约3 km的Santa Fe群沉积物。
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引用次数: 26
A stream-sediment geochemical map (from NURE data) showing bulk silica distribution within the Eocene San Jose Formation, San Juan Basin, New Mexico 来自NURE数据的河流-沉积物地球化学图显示了新墨西哥州圣胡安盆地始新世圣何塞组的大块二氧化硅分布
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.317
R. Chamberlin, James S. Harris, Margaret I. Onimole
We present a geochemical map showing the estimated silica (eSiO,) content of 496 NURE streamsediment samples collected within the Eocene San Jose Fonnation. This computer-generated map essentially shows the bulk distribution of quartz within the fonnation. The formation is clearly divisible into a central lowsilica (low quartz) domain, a western intennediate-s ilica domain and a ~outheastern high-sil ica domain. Our follow-up stream-sediment sampl ing and analys is have verified the chemical patterns seen in the NURE data. Preliminary petrographic study of follow-up stream-sedi ment samples inuicates that quartz/fe ldspar ratios are relative ly constant within each silica domain, as defined by the NURE data. Some second-order noise within silica domains apparently retlects high concentrations of mudstone grains or heavy minerals in the NURE samples . Quart z/feldspar est imates from 44 thin sections of San Jose sandstones demonstrate a good correlat ion of granite-derived arkose with the low-silica domain, cherty subarkose with the intermediate-silica domain , and subfeldspathic arenite with the high-silica domain . We interpret the intermediate-,ilica . subarkosic strata and the high-silica, subfeldspathic strata as the products of southerly flowi ng early E.ocene river systems that entered the basin near Aztec and Llaves . respectively ; these rivers appear to have joined near Cuba. Preliminary field observations and second-order geochemical patterns suggest that the low-silica, arkos ic strata represent relatively thi n deposits of a younger river system which overlies the main body of San Jose strata. Additional data are needed to accurate ly define the geometry of low-si lica arkosic strata within the San Jose Formation.
我们展示了一幅地球化学图,显示了在始新世圣何塞Fonnation中收集的496个NURE河流沉积物样本中估计的二氧化硅(eSiO)含量。这张计算机生成的地图基本上显示了地层中石英的总体分布。地层可划分为中部低硅(低石英)域、西部中硅石域和东部高硅石域。我们后续的河流沉积物取样和分析已经证实了在NURE数据中看到的化学模式。对后续河流-沉积物样品进行的初步岩石学研究表明,石英/铁-晶石比率在每个硅域内相对恒定,正如NURE数据所定义的那样。二氧化硅区域内的一些二阶噪声明显反映了NURE样品中高浓度的泥岩颗粒或重矿物。对圣何塞砂岩44个薄片的石英/长石测试结果表明,花岗岩长石与低硅域、硅质亚长石与中硅域、亚长石砂与高硅域具有良好的相关性。我们解释中间-,ilica。亚黑质地层和高硅质、亚长石质地层是早始新世南流河流系统的产物,这些河流系统进入阿兹特克和拉维斯附近的盆地。分别;这些河流似乎在古巴附近汇合。初步的野外观测和二级地球化学模式表明,低硅质、arkos地层代表了覆盖在San Jose地层主体上的较年轻的河流体系的相对较低的沉积物。需要更多的数据来精确地定义圣何塞组内低硅碳黑岩地层的几何形状。
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引用次数: 0
Reassignment of the Jurassic Todilto Limestone Ostocode Metacypris Todiltoensis Swain 1946, to Cytheridella, with notes on the phylogeny and environmental implications of this Ostracode 侏罗纪Todilto石灰石介形虫科Metacypris Todiltoensis Swain 1946重新划分为Cytheridella,并对该介形虫科的系统发育和环境意义作了说明
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.173
K. Kietzke
-Metacypris todilroensis Swain, 1946, should be reassigned to the genus Cytheridel/a Daday, I 905, to accommodate it better in the current organization of the Limnocytheridae. This placement is based on muscle scar structure, the single sulcus and close similarity of surface ornamentation. This species represents an important link between the ancestral Lutkevichinella faunas of the Triassic and the extant genus Cwheridella. The occurrence of this ostracode in the saline to hypersaline Todilto environments can be understood in terms of readaptation of a brackish-water ostracode group and perhaps in the possible parthenogenic nature of this species.
-Metacypris todilroensis Swain, 1946,应重新分配到Cytheridel属/a Daday, I 905,以更好地适应目前的Limnocytheridae组织。这种位置是基于肌肉疤痕结构,单一沟和表面纹饰的密切相似。该种代表了三叠纪祖先Lutkevichinella动物群与现存的Cwheridella属之间的重要联系。这种介形虫出现在咸水到高咸水的Todilto环境中,可以从微咸水介形虫群的重新适应和该物种可能的单性生殖性质来理解。
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引用次数: 2
Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (Upper Cretaceous), San Juan Basin, New Mexico 新墨西哥州圣胡安盆地上白垩统Fruitland组和Kirtland组地层、古生物学和时代
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.217
A. Hunt, S. Lucas
---- Campanian-Maastrichtian nonmartne strata of the San Juan Basin pertain to the Fruitland Formation and the Kirtland Formation. The Kirtland consists, in ascending order, of the Bisti, Hunter Wash, Farmington. De-na-zin and Naashoibito Members. The Fruitland is dominantly of deltaic and paludal origin and the Kirtland is of broadly fluvial origin. The Bisti Member is a gas reservoir. The majority of fossil vertebrates are from an interval in the uppermost Fruitland and from the Naashoibito Member. Distinct vertebrate and invertebrate faunas and floras can be distinguished for the Fruitland, pre-Naashoibito Kirtland and Naashoibito. Diverse evidence indicates that the Fruitland is of Judithian (late Campanian) age, the pre-Naashoibito Kirtland is of Edmontonian (early Maastrichtian) age and the Naashoibito is of Lancian (late Maastrichtian) age. There is no large-scale angular unconformity at the base of the Ojo Alamo Sandstone.
----圣胡安盆地坎帕尼亚-马斯特里赫特非martne地层属于Fruitland组和Kirtland组。科特兰包括,按升序排列,比斯蒂,亨特沃什,法明顿。De-na-zin和Naashoibito成员。果地主要是三角洲和古滩成因,科特兰则是广泛的河流成因。Bisti Member是一个天然气储层。大多数脊椎动物化石来自最上层果地的一个区间和Naashoibito段。果地、前Naashoibito、Kirtland和Naashoibito有明显的脊椎动物和无脊椎动物区系。不同的证据表明,果地属于朱迪特时代(坎帕尼亚晚期),前Naashoibito Kirtland属于埃德蒙顿时代(马斯特里赫特早期),Naashoibito属于兰西亚时代(马斯特里赫特晚期)。奥霍阿拉莫砂岩底部不存在大规模的角度不整合。
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引用次数: 22
Rapid adjustment of the Rio Puerco to meander cutoff: Implications for effective geomorphic processes, crossing thresholds and timing of events. Rio Puerco对曲流截断的快速调整:对有效地貌过程、跨越阈值和事件时间的影响。
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.399
D. Love
A meander loop of the upper Rio Puerco of the east experienced a neck cutoff during the late winter-early spring of 1988, temporarily changing the gradient of the stream from 0.003 (m/m) to 0.25 . Observations before, during and after the cutoff document (I) that cutoff was not a major disruption for the stream, (2) that timing, order and duration of events are important in crossing geomorphic thresholds and subsequent adjustments, (3) that the threshold for cutoff was lowered considerably by erosion and humans in preceding years, (4) that breaching was thwarted temporarily by low-flow processes, (5) that initial breaching took place during moderate flow, and (6) that subsequent large flows in 1988 caused both width and gradient to be fully adjusted with upstream and downstream values within one flow season. The steep gradient of the breach did not propagate upstream as a headwall; rather the slope increased slightly upstream and extended until the former gradient was reached.
在1988年冬末春初,东部普尔科河上游的一条曲流环经历了一次断流,暂时将河流的坡度从0.003 (m/m)改变为0.25。在截流之前、期间和之后的观察(1)截流不是河流的主要破坏,(2)事件发生的时间、顺序和持续时间对跨越地貌阈值和随后的调整很重要,(3)截流的阈值因前几年的侵蚀和人类活动而大大降低,(4)低流量过程暂时阻止了决口,(5)最初的决口发生在中等流量期间,(6)随后1988年的大流量使宽度和梯度在一个流季内完全随上下游值调整。裂口的陡峭坡度并没有向上游扩散,形成一个顶墙;相反,坡度在上游略有增加并延伸,直到达到前一个坡度。
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引用次数: 1
Supplemental road log 3: From Durango, Colorado to Pinyon Mesa and the Bluffs south of the San Juan River near Farmington 补充道路日志3:从科罗拉多州杜兰戈到法明顿附近圣胡安河以南的皮尼恩梅萨和布洛夫斯
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.73
S. Lucas, T. Williamson
Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico.
自1950年以来,每年秋天,新墨西哥地质学会(NMGS)都会举行一次年度秋季实地会议,探索新墨西哥(或周边各州)的一些地区。这些会议总是很受欢迎,为与会者提供了一本指南。除了详细的道路日志外,指南还包含许多精心编写、编辑和同行评审的地球科学论文。这些书为地质指南书设定了国家标准,是在新墨西哥州或附近工作的任何人必不可少的地质参考资料。
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引用次数: 0
Paleo-Indians in the San Juan Basin: A paleontological perspective 圣胡安盆地的古印第安人:古生物学视角
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.333
F. O’Neill
A large gap exists in our knowledge of the Pleistocene and Holocene cultural and faunal record in the San Juan Basin. Information concerning the activities of Paleo-Indians in the basin is often based on inference from other areas. Evidence found elsewhere suggests that they exploited large migratory herds of now extinct megafauna (e.g., mammoth. horse . bison and camel) . Additionally, the paleontological record of the Pleistocene and Holocene is virtually nonexistent. Some evidence suggests that mammoth. horse, elk. bighorn sheep, pronghorn antelope and muskox were the major herbivores present in the basin during th is period. The physiographic and environmental nature of the basin allowed access and exploitation of the forage resources to these an imals and apparently restricted access to bison. Traditional thinking about the lifeways of the Paleo-Indians that lived in the basin should be re-examined and founded on different research methodology before we can fully understand the story of these early human migrants and their relationship to the environment. Interdisciplinary and interagency cooperation is a cri tical factor in developing a basis for our understand ing of past life in the San Juan Basin.
我们对圣胡安盆地更新世和全新世文化和动物记录的认识还存在很大的空白。关于盆地中古印第安人活动的信息常常是根据其他地区的推断得出的。其他地方发现的证据表明,他们利用了现已灭绝的大型动物(如猛犸象)的大型迁徙群。马。野牛和骆驼)。此外,更新世和全新世的古生物学记录几乎不存在。一些证据表明,猛犸象。马,麋鹿。大角羊、叉角羚和麝牛是这一时期盆地主要的食草动物。该盆地的地理和环境性质允许这些动物获取和利用饲料资源,但显然限制了野牛的获取。在我们能够完全理解这些早期人类移民的故事以及他们与环境的关系之前,我们应该重新审视和建立不同的研究方法,对生活在盆地中的古印第安人的生活方式进行传统的思考。跨学科和机构间的合作是为我们了解圣胡安盆地过去的生活奠定基础的关键因素。
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引用次数: 1
Hydrocarbon potential and stratigraphy of the Pictured Cliffs, Fruitland and Ojo Alamo Formations in the northeastern San Juan Basin. 圣胡安盆地东北部picture Cliffs、Fruitland和Ojo Alamo组油气潜力及地层特征
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.359
W. F. Hoppe
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引用次数: 0
Parasequence geometry and facies architecture in the upper Cretaceous Point Lookout Sandstone, Four Corners platform, southwestern Colorado 美国科罗拉多州西南部Four Corners台地上白垩统Point Lookout砂岩的准层序几何和相结构
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.187
Danny R. Katzman, R. Wright-Dunbar
-In the Upper Cretaceous Point Lookout Sandstone in southwestern Colorado, the presence of distinctly different scales of transgressive deposits defines a hierarchy of high-frequency, nearshore-marine transgressive-regressive cycles. The two cycle scales, parasequences and parasequence sets, are delineated on the basis of thickness and lithologic characteristics of the transgressive deposits at inner-shelf and back-barrier positions. This observation is contrary to most previous work on cycles at this scale, which suggests that the stratigraphic record is composed of regressive strata with the transgressive portion of the cycle being represented only by a surface of erosion or nondeposition. Here, we recognize that both regressive and transgressive deposits are important components of the cycle stratigraphy.
在科罗拉多州西南部的上白垩统Point Lookout砂岩中,不同规模的海侵沉积的存在定义了一个高频、近岸-海侵-海退旋回的等级。根据陆架内和障壁后海侵沉积的厚度和岩性特征,圈定了副层序和副层序组两个旋回尺度。这一观察结果与以往在这一尺度上对旋回的大多数研究相反,后者表明地层记录是由退退地层组成的,旋回的海侵部分仅由侵蚀或非沉积表面表示。在此,我们认识到海退沉积和海侵沉积都是旋回地层的重要组成部分。
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引用次数: 3
Sequence stratigraphy in ramp settings--With application to upper Cretaceous rocks in the San Juan Basin 斜坡地层中的层序地层学——以圣胡安盆地上白垩统岩石为例
Pub Date : 1900-01-01 DOI: 10.56577/ffc-43.185
D. Nummedal
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引用次数: 0
期刊
San Juan Basin IV
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