Volcanism on the passive margin of Laurentia: an early Paleozoic analogue of Cretaceous volcanism on the northeastern American margin: Reply

1990 ◽  
Vol 27 (11) ◽  
pp. 1552-1554 ◽  
Author(s):  
Stephen Kumarapeli ◽  
Karen St. Seymour ◽  
Hillar Pintson ◽  
Elizabeth Hasselgren
Keyword(s):  
Passive Margin ◽  
Early Paleozoic ◽  
Cretaceous Volcanism

scholarly journals Early Paleozoic rifting and reactivation of a passive-margin rift: Insights from detrital zircon provenance signatures of the Potsdam Group, Ottawa graben: Comment

2019 ◽  
Vol 131 (3-4) ◽  
pp. 695-698
Author(s):  
Ed Landing ◽  
Osman Salad Hersi ◽  
Lisa Amati ◽  
Stephen R. Westrop ◽  
David A. Franzi
Keyword(s):  
Detrital Zircon ◽  
Passive Margin ◽  
Early Paleozoic

The initiation of the early Paleozoic Cordilleran miogeocline: evidence from the uppermost Proterozoic – Lower Cambrian Hamill Group of southeastern British Columbia

1988 ◽  
Vol 25 (1) ◽  
pp. 1-19 ◽  
Author(s):  
William J. Devlin ◽  
Gerard C. Bond
Keyword(s):  
British Columbia ◽  
Lower Cambrian ◽  
Direct Evidence ◽  
Thermal Anomaly ◽  
Passive Margin ◽  
Early Paleozoic ◽  
Upper Proterozoic ◽  
Windermere Supergroup ◽  
Depositional Setting ◽  
Thermal Subsidence

The uppermost Proterozoic–Lower Cambrian Hamill Group of southeastern British Columbia contains geologic evidence for a phase of extensional tectonism that led directly to the onset of thermally controlled subsidence in the Cordilleran miogeocline. Moreover, the Hamill Group contains the sedimentological record of the passage of the ancient passive margin from unstable tectonic conditions associated with rifting and (or) the earliest phases of thermal subsidence to post-rift conditions characterized by stabilization of the margin and dissipation of the thermal anomaly generated during the rift phase (the rift to post-rift transition). Widespread uplift that occurred prior to and during the deposition of the lower Hamill Group is indicated by an unconformable relation with the underlying Windermere Supergroup and by stratigraphic relations between Middle and Upper Proterozoic strata and unconformably overlying upper Lower Cambrian quartz arenites (upper Hamill Group) in the southern borderlands of the Hamill basin. In addition, the coarse grain size, the feldspar content, the depositional setting, and the inferred provenance of the lower Hamill Group are all indicative of the activation of basement sources along the margins of the Hamill basin. Geologic relations within the Hamill Group that provide direct evidence for extensional tectonism include the occurrence of thick sequences of mafic metavolcanics and rapid vertical facies changes that are suggestive of syndepositional tectonism.Evidence of extensional tectonism in the Hamill Group directly supports inferences derived from tectonic subsidence analyses that indicate the rift phase that immediately preceded early Paleozoic post-rift cooling could not have occurred more than 10–20 Ma prior to 575 ± 25 Ma. These data, together with recently reported isotopic data that suggest deposition of the Windermere Supergroup began ~730–770 Ma, indicate that the rift-like deposits of the Windermere Supergroup are too old to represent the rifting that led directly to the deposition of the Cambro-Ordovician post-rift strata. Instead, Windermere sedimentation was apparently initiated by an earlier rift event, probably of regional extent, that was part of a protracted, episodic rift history that culminated with continental breakup in the latest Proterozoic – Early Cambrian.

The passive margin of northern Gondwana during Early Paleozoic: Evidence from the central Tibet Plateau

2020 ◽  
Vol 78 ◽  
pp. 126-140 ◽  
Author(s):  
Yiming Liu ◽  
Sanzhong Li ◽  
M. Santosh ◽  
Huahua Cao ◽  
Shengyao Yu ◽  
...  
Keyword(s):  
Passive Margin ◽  
Tibet Plateau ◽  
Early Paleozoic ◽  
Central Tibet

Mantle Exhumation in an Early Paleozoic Passive Margin, Northern Cordillera, Yukon

2003 ◽  
Vol 111 (3) ◽  
pp. 313-327 ◽  
Author(s):  
D. Canil ◽  
S. T. Johnston ◽  
K. Evers ◽  
J. G. Shellnutt ◽  
R. A. Creaser
Keyword(s):  
Passive Margin ◽  
Early Paleozoic ◽  
Mantle Exhumation

Early Paleozoic development of the Maine-Quebec Boundary Mountains region

2006 ◽  
Vol 43 (3) ◽  
pp. 367-389 ◽  
Author(s):  
C C Gerbi ◽  
S E Johnson ◽  
J N Aleinikoff ◽  
J H Bédard ◽  
G R Dunning ◽  
...  
Keyword(s):  
New England ◽  
Passive Margin ◽  
Geochemical Data ◽  
Early Paleozoic ◽  
Mountain Building ◽  
Appalachian Mountain ◽  
Early Ordovician ◽  
History Of

Pre-Silurian bedrock units played key roles in the early Paleozoic history of the Maine–Quebec Appalachians. These units represent peri-Laurentian material whose collision with the craton deformed the Neoproteozoic passive margin and initiated the Appalachian mountain-building cycle. We present new field, petrological, geochronological, and geochemical data to support the following interpretations related to these units. (1) The Boil Mountain Complex and Jim Pond Formation do not represent part of a coherent ophiolite. (2) Gabbro and tonalite of the Boil Mountain Complex intruded the Chain Lakes massif at ca. 477 Ma. (3) The Skinner pluton, an arc-related granodiorite, intruded the Chain Lakes massif at ca. 472 Ma. (4) The Attean pluton, with a reconfirmed age of ca. 443 Ma, is unrelated to Early Ordovician orogenesis. (5) The most likely timing for the juxtaposition of the Jim Pond Formation and the Boil Mountain Complex was during regional Devonian deformation. These interpretations suggest that the Boundary Mountains were once part of a series of arcs extending at least from central New England through Newfoundland.

scholarly journals Early Paleozoic rifting and reactivation of a passive-margin rift: Insights from detrital zircon provenance signatures of the Potsdam Group, Ottawa graben: Reply

2019 ◽  
Vol 131 (3-4) ◽  
pp. 699-703
Author(s):  
David G. Lowe ◽  
R.W.C. Arnott ◽  
Jeffrey R. Chiarenzelli ◽  
Robert H. Rainbird ◽  
Godfrey S. Nowlan
Keyword(s):  
Detrital Zircon ◽  
Passive Margin ◽  
Early Paleozoic
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