Assessing the role of orogen-parallel faulting in post-orogenic exhumation: low-temperature thermochronology across the Norumbega Fault System, Maine

2008 ◽  
Vol 45 (3) ◽  
pp. 287-301 ◽  
Author(s):  
David P. West ◽  
Mary K. Roden-Tice ◽  
Jaime K. Potter ◽  
Nellie Q. Barnard
Keyword(s):  
Low Temperature ◽  
New England ◽  
Vertical Displacement ◽  
Fault System ◽  
Late Mesozoic ◽  
South Central ◽  
History Of ◽  
Northern New England ◽  
Restraining Bend

As a part of a regional effort to determine the extent of low-temperature thermochronological discontinuities across major orogen-parallel faults in northern New England, 41 apatite fission track (AFT) ages and 11 (U–Th)/He ages are used to constrain the ∼65 to 100 °C cooling history of rocks flanking a 160 km long segment of the Norumbega fault system in southern and south-central Maine. These data are used to evaluate the role of this structure in the late Mesozoic and younger exhumation history of the northern Appalachians. AFT ages flanking the fault system range from 159 to 95 Ma and record cooling below ∼100 °C in the late Mesozoic. (U–Th)/He ages from the same region range from 126 to 100 Ma and record cooling below ∼65 °C. Previously published AFT ages from an ∼40 km long segment of the fault system just north of Casco Bay reveal a dramatic time–temperature discontinuity across the structure and suggest kilometre-scale late Mesozoic displacement in this region. However, new AFT and (U–Th)/He ages along the strike of the Norumbega fault system to the northeast and southwest of this discontinuity show no significant differences in late Mesozoic cooling and suggest no significant displacements occurred along these portions of the fault system during this time. Collectively the data suggest differential late Mesozoic reactivation of the Norumbega fault system with the reactivation localized in areas that had previously experienced episodes of vertical displacement in the late Paleozoic (i.e., the “Casco Bay restraining bend”).

A Building History of Northern New England

APT Bulletin ◽  
2002 ◽  
Vol 33 (1) ◽  
pp. 56
Author(s):  
Robert A. Young ◽  
James L. Garvin
Keyword(s):  
New England ◽  
History Of ◽  
Northern New England

Late Mesozoic and Cenozoic tectonic history of south central California

Tectonics ◽  
1984 ◽  
Vol 3 (6) ◽  
pp. 659-675 ◽  
Author(s):  
A. E. J. Engel ◽  
P. A. Schultejann
Keyword(s):  
Central California ◽  
Late Mesozoic ◽  
Tectonic History ◽  
South Central ◽  
History Of

scholarly journals Trace metals in Northern New England streams: Evaluating the role of road salt across broad spatial scales with synoptic snapshots

PLoS ONE ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. e0212011 ◽  
Author(s):  
Jessica F. Wilhelm ◽  
Daniel J. Bain ◽  
Mark B. Green ◽  
Kathleen F. Bush ◽  
William H. McDowell
Keyword(s):  
Trace Metals ◽  
New England ◽  
Spatial Scales ◽  
Road Salt ◽  
Northern New England

scholarly journals A History of Koshe Town in South-Central Ethiopia from 1941 to 1991

2020 ◽  
Vol 20 (1) ◽  
pp. 119-137
Author(s):  
Yohannes Tesfaye Getachew
Keyword(s):  
Research Paper ◽  
Military Regime ◽  
Central Ethiopia ◽  
South Central ◽  
Important Development ◽  
History Of ◽  
The Government ◽  
The Military ◽  
Commercial Center

Abstract Koshe town is the administrative and commercial center of Mareko woreda.1 It is found in Gurage Zone Southern Nation Nationalities and Peoples Regional State. According to the tradition the origin of the name “Koshe” is originated from the plant which called by the name Koshe which abundantly grow in the area. The establishment of Koshe town is directly associated with the five years Italian occupation. Due to the expansion of patriotic movement in the area Italian officials of the area forced to establish additional camp in the area in a particular place Koshe. This paper explores the role of Fascist Italy for the establishment of Koshe town. The former weekly market shifted its location and established around the Italian camp. Following the evacuation of Fascist Italy the Ethiopian governments control the area. During the government of Emperor Haile Selassie Koshe town got some important developmental programs. The most important development was the opening of the first school by the effort of the Swedes.2 The Military regime (Derg)3 also provided important inputs for the urbanization of Koshe town. This research paper observes the development works that flourish in Koshe during the reign of Emperor Haile Selassie and the Military regime, and also asses the role of different organizations for the urbanization of Koshe town.

A Life in History: Making the Team

2021 ◽  
Author(s):  
John Reid
Keyword(s):  
New England ◽  
Graduate School ◽  
Collaborative Work ◽  
Comparative Approach ◽  
Atlantic Canada ◽  
History Of Higher Education ◽  
The United Kingdom ◽  
Faculty Positions ◽  
History Of ◽  
Northern New England

This article traces the author’s path from early life in the United Kingdom to graduate school in Newfoundland and New Brunswick and then to a series of faculty positions – ultimately, at Saint Mary’s University. Early work in the seventeenth-century history of northern New England gave way to a more broadly comparative approach to this era and, eventually, to an effort to coordinate imperial, colonial, and Indigenous history in northeastern North America. A variety of career uncertainties and evolutions also led to involvement in the history of higher education, the history of Atlantic Canada, and the history of sport. Through it all, collaborative work developed as a recurrent approach, with Atlantic Canada themes frequently underpinning responses to a variety of historiographies.

scholarly journals River profile response to normal fault growth and linkage: An example from the Hellenic forearc of south-central Crete, Greece

2016 ◽  
Author(s):  
Sean F. Gallen ◽  
Karl W. Wegmann
Keyword(s):  
Drainage Basin ◽  
Profile Analysis ◽  
Normal Fault ◽  
Drainage Area ◽  
Fault System ◽  
Stream Power ◽  
River Incision ◽  
South Central ◽  
History Of ◽  
Fault Growth

Abstract. Topography is a reflection of the tectonic and geodynamic processes that act to uplift the Earth's surface and the erosional processes that work to return it to base level. Numerous studies have shown that topography is a sensitive recorder or tectonic signals. A quasi-physical understanding of the relationship between river incision and rock uplift has made the analysis of fluvial topography a popular technique for deciphering relative, and some argue absolute, histories of rock uplift. Here we present results from a study of the fluvial topography from south-central Crete demonstrating that river longitudinal profiles indeed record the relative history of uplift, but several other processes make it difficult to recover quantitative uplift histories. Prior research demonstrates that the south-central coastline of Crete is bound by a large (~100 km long) E-W striking composite normal fault system. Marine terraces reveal that it is uplifting between 0.1–1.0 mm yr−1. These studies suggest that two normal fault systems, the offshore Ptolemy and onshore South-Central Crete faults linked together in the recent geologic past (Ca. 0.4–1 Myrs bp). Fault mechanics predicts that when adjacent faults link into a single fault the uplift rate in the linkage zone will increase rapidly. Using river profile analysis we show that rivers in south-central Crete record the relative uplift history of fault growth and linkage, as theory predicts that they should. Calibration of the commonly used stream power incision model shows that the slope exponent, n, is ~ 0.5, contrary to most studies that find n ≥ 1. Analysis of fluvial knickpoints shows that migration distances are not proportional to upstream contributing drainage area, as predicted by the stream power incision model. Maps of the transformed stream distance variable, χ, indicate that drainage basin instability, drainage divide migration and river capture events complicate river profile analysis in south-central Crete. Waterfalls are observed in southern Crete and appear to operate under less efficient and different incision mechanics than assumed by the stream power incision model. Drainage area exchange and waterfall formation are argued to obscure linkages between empirically derived metrics and quasi-physical descriptions of river incision, making is difficult to quantitatively interpret rock uplift histories from river profiles in this setting. Karst hydrology, break down of assumed drainage area-discharge scaling and chemical weathering might also contribute to the failure of the stream power incision model to adequately predict the behavior of the fluvial system in south-central Crete.

A Building History of Northern New England James L. Garvin

2002 ◽  
Vol 24 (2) ◽  
pp. 109-111
Author(s):  
Claire W. Dempsey
Keyword(s):  
New England ◽  
History Of ◽  
Northern New England

scholarly journals Elevated Bladder Cancer In Northern New England: The Role Of Drinking Water And Arsenic

2015 ◽  
Vol 2015 (1) ◽  
pp. 787
Author(s):  
Dalsu Baris, Debra Silverman ◽  
Dalsu Baris, Debra Silverman
Keyword(s):  
Bladder Cancer ◽  
Drinking Water ◽  
New England ◽  
Northern New England

scholarly journals Mesozoic–Cenozoic Uplift/Exhumation History of the Qilian Shan, NE Tibetan Plateau: Constraints From Low-Temperature Thermochronology

2021 ◽  
Vol 9 ◽  
Author(s):  
Lihao Chen ◽  
Chunhui Song ◽  
Yadong Wang ◽  
Xiaomin Fang ◽  
Yihu Zhang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Low Temperature ◽  
Tectonic Deformation ◽  
Mountain Range ◽  
The Tibetan Plateau ◽  
Two Phase ◽  
Late Mesozoic ◽  
Plate Convergence ◽  
History Of ◽  
Upward Growth

The Qilian Shan, which is located along the northeastern margin of the Tibetan Plateau, plays a key role in understanding the dynamics of the outward and upward growth of the plateau. However, when and how tectonic deformation evolved into the geographic pattern which is currently observed in the Qilian Shan are still ambiguous. Here, apatite fission track (AFT) thermochronology and sedimentology were conducted to interpret the low-temperature tectonic deformation/exhumation events in well-dated Late Miocene synorogenic sediment sequences in the Xining Basin, which is adjacent to the southern flank of the Qilian Shan. These new low-temperature thermochronological results suggest that the Qilian Shan experienced four stages of tectonic exhumation during the late Mesozoic–Cenozoic. The Late Cretaceous exhumation events in the Qilian Shan were caused by the diachronous Mesozoic convergence of the Asian Plate and Lhasa Block. In the early Cenozoic (ca. 68–48 Ma), the Qilian Shan quasi-synchronously responded to the Indian–Asian plate collision. Subsequently, the mountain range experienced a two-phase deformation during the Eocene–Early Miocene due to the distal effects of ongoing India–Asia plate convergence. At ca. 8 ± 1 Ma, the Qilian Shan underwent dramatic geomorphological deformation, which marked a change in subsidence along the northeastern margin of the Tibetan Plateau at that time. Our findings suggest that the paleogeographic pattern in the northeastern Tibetan Plateau was affected by the pervasive suture zones in the entire Qilian Shan, in which the pre-Cenozoic and Indian–Asian plate motions reactivated the transpressional faults which strongly modulated the multiperiodic tectonic deformation in northern Tibet during the Cenozoic. These observations provide new evidence for understanding the dynamic mechanisms of the uplift and expansion of the Tibetan Plateau.

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