how were the franklin mountains formed

Your email address will not be published. +- 10 m.y. locally contain the mylonitic fabric and appear to be syn-late kinematic.

We found that the style of deformation in the Chihuahua trough is variable.

settlement history The Boletn de la Sociedad Geolgica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earths crust.

In places such as the East Potrillo Mountains and Indio Mountains is typical of the thin- skinned style, associated with the Cordilleran thrust belt, while in other places, the thick skinned deformation present is typical of the Laramide orogeny in the southern Rocky Mountains. Undeformed pegmatite, granite, and microdiorite appear as dikes throughout the region. Save my name, email, and website in this browser for the next time I comment. These rocks may represent the lithology of possible Proterozoic exploration targets. The age (1,097.5 Ma) for gabbro in the Poersch [number sign]1 well in northern Kansas, as well as the general petrographic characteristics of the sedimentary rocks throughout the area favors a correlation with established Keweenawan stratigraphy in the Lake Superior region.

Typical high-potassium granite.

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The possibility of massive sulfides to occur in the mafic intrusive rocks must not be excluded. Cretaceous and Jurassic intrusive rocks occur in five major belts and two minor belts in the region and Paleozoic intrusive rocks occur in four major and two minor belts. (It is unknown what substrate the Castner Marble was deposited upon.)

On the other hand, the orientation of the shortening direction can be explained based on the geometry of the trough and especially the strike of its eastern margin.

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Three critical regions within the study area show that these mountains contain structural complexities. Their trends are between N 60/sup 0/ E and N 77/sup 0/ E, suggesting that the greatest extensional strain in the area at that time was NNW--SSE. The Institute of Geology (IGI) is a unit of the National Autonomous University of Mexico (UNAM) that belongs to the Subsystem of Scientific Research (SIC). Vertical silicic dikes at southern TM trend N5-25E and are dated at 148[+-]14 Ma, coeval with the Independence dike swarm (IDS). This item is part of a JSTOR Collection. The olivine diabase dikes, and one diabase dike, have K/Ar ages which range from Uppermost Proterozoic to Middle Cambrian. The E- to SE-vergence and mid-late Jurassic age of ductile shear zones in the TM region are similar to that in nearby parts of the East Sierra Thrust System (ESTS).

In the core from the Poersch [number sign]1 well sulfides are recognized in gabbroic sills or dikes.

Final report, July 1, 1977--June 30, 1978, Magmatic and metamorphic belts and plutonic-metamorphic complexes of southeastern Alaska, Univ. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. The youngest magmatic features are Quaternary-age pre- and post-glacial volcanic rocks that occur in three major fields in the region, as well as in isolated locations.

MTCtEF7soH![N=ScRAGhT;l |wKkH *Oi~)(Ti# 9XHm81FACo;T'Hw5OeBs &22-\ Are the Franklin Mountains part of the Rocky Mountains? This feature appears to predate formation of the mafic body in the CBP (1163 Ma) and is most likely related to Pre-Grenville tectonics, possibly representing a continental margin arc batholith.

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Im guessing the former, but there would also seem to be a pretty radical shift in provenance (and flow regime!) Atop this is the Bliss Formation, a Cambrian quartz arenite (quartz sandstone). Required fields are marked *.

Three large high-angle faults define the boundaries of map. Critical area two contains multiple NNW-trending faults, three sills and a possible landslide.


Map scale relationships indicate that motion on high angle basement involved thrusts post dates low angle thrusting. Restoration of folds and the IDS to the regional NW trend results in top to the E to NE sense of shear during Jurassic deformation.


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based on fossil evidence) is not very distinct.

1) The conglomerate is part of just one of the formations that is part of what is collectively called the Thunderbird Group.This conglomerate layer is part of the Coronado Hills Fm.

We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mapping of middle Proterozoic igneous rocks and the paired anomalies outlines a 530 km diameter area of distributed east-west-oriented extension. `I{N'g(}A{ U5#NIh'K,JP[C^p!jA|`C#+%t 22lx]>BIQ2dYii!=(W Qt"5g(?sr'e3%6PA3;c}}Ap7h;#Js5|%LOFUT1psFd)F g]JApJa.-+`U5sm9&Q'K8\rZ},^ |8D_w.T?52XWo,@#^2hZdqagbLk H.I\RjnPF@6dR`udZTLKe\JU1Ag7C Dept. Thermal maturation within the rift probably ranges from within the oil window to over maturity.

Lets take a walk up the east side of the Franklin Mountains, north of El Paso, Texas, to walk across the Great Unconformity. The Franklin Mountains are often referred to as a simple fault block mountain range related to the Rio Grande Rift.

Sometimes, its dubbed herringbone cross-stratification. of Geosciences.

This study is in preliminary stages; as more data are accumulated on dike trends, types, and K/Ar dates, a more complete paleostrain record will emerge.

inferring a relationship between the Red Bluff being the source of the Thunderbirds volcaniclastics. North Franklin Mountain Beside this, how were the Franklin Mountains formed? The authors interpret this to be related to late Cenozoic strike-slip faults. This is consistent with the two sets of faults forming during a single progressive deformation with in - sequence - thrusting migrating out of the basin onto the platform.

Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. and is the oldest of the Thunderbird Group.

The AGM is an east-northeast-trending, 600 km long, gravity low, which extends from the Texas-Oklahoma border through the central basin platform (CBP) to the Delaware basin.

Perhaps hell chime in with a response. Request Permissions, Boletn de la Sociedad Geolgica Mexicana, Published By: Sociedad Geolgica Mexicana & Instituto de Geologa UNAM, Read Online (Free) relies on page scans, which are not currently available to screen readers. Twenty lithologic units are present in the field area, including the southernmost Precambrian meta-sedimentary rocks in the Franklin Mountains (Lanoria Quartzite and Thunderbird group conglomerates).

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The classic Great Nonconformity that we show in El Paso is in Mckelligon Canyon where the Red Bluff Granite lies directly below the Bliss Sandstone, to the point where you can place your hand on both units (! A texturally and compositionally heterogeneous amphibolite-facies monzonitic complex which intrudes the basement and metasediments yields a mid-Jurassic age. for the trachyte. Unconformity above the granite, below the conglomerate, for a nonconformity, sensu stricto. Dike trends range from N 60/sup 0/ E through E--W to N 75/sup 0/ W, and dike widths vary between 0.15 and 0.80 m. Crosscutting dikes were dated at three locations by use of the conventional K/Ar whole-rock method, The Cordilleran orogen in southeastern Alaska includes 24 distinct magmatic belts, ranging in age from Cambrian to Holocene, that are defined by map relations, lithology, age, and chemical composition.

Shortening directions estimated from the geometry of folds and faults and inversion of fault slip data indicate that both basement involved structures and faults within the basin record a similar Laramide deformation style.

In similar manner, a second dated diabase dike suggests that the greatest extensional strain in the Lower Devonian was NNE--SSW.

Correlation of various stratigraphic units over any distance is complicated by tectonic activity occurring at several times during the Precambrian and Paleozoic.

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Cenozoic kaolinite sills and mafic intrusion have filled many of the fault zones.

A dated trachyte dike suggests that the axis of maximum extensional strain by Middle Devonian time was NS. Your email address will not be published.

According to most geographic definitions, the Franklin Mountains are not part of the Rocky Mountains Range.

Geologic mapping in the southern portion of the Franklin Mountains has revealed many previously unrecognized structural complexities.

cambrian, granite, igneous, mesoproterozoic, primary structures, proterozoic, sediment, texas, trace fossils, unconformities, weathering AbstractIn this article we studied the northern part of the Laramide foreland of the Chihuahua Trough. Similar dikes that occur at TM trend N60-80E. Now lets climb up the trail.

Controlled speculation on Paleozoic and Mesozoic structural events in the northern New York region may then be possible.

of Texas, El Paso, TX (United States).

The purpose of this work is twofold; first we studied whether the deformation involves or not the basement along crustal faults (thin- or thick- skinned deformation), and second, we studied the nature of the principal shortening directions in the Chihuahua Trough. The Franklin Mountains record the transition from thick- to thin skinned deformation. three contains numerous small faults which generally trend NNE.

There may be an additional disconformity between the conglomerate and the sandstone, with additional time missing there, but if so, I dont know about it.

Let me outline a few that I spotted, and then you can go back to the unannotated original photo and see if you can spot any others. for olivine diabases, 536 +- 11 m.y. It has Skolithos trace fossils in it, just like Virginias Antietam Formation (which is of the same age): Though these arent the most impressive Skolithos Ive ever seen, they are at least diagnostic of vascularized body plans, and therefore of the Cambrian period of geologic time.

The Franklins were formed during the Laramide mountain-building period in late Cretaceous time, 60 million to 70 million years ago.What are the letters on Franklin Mountains?The letters you can easily spot on the Franklin Mountains are E, A, J, and I.

Middle proterozoic tectonic activity in west Texas and eastern New Mexico and analysis of gravity and magnetic anomalies, Mesozoic intra-arc tectonics in the NE Mojave Desert, CA, Dikes of Rand Hill, northeast Adirondacks, as paleostrain indicators.

El Instituto de Geologa (IGl) es una dependencia de la Universidad Nacional Autnoma de Mxico (UNAM) que pertenece al Subsistema de la Investigacin Cientfica (SIC).

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