2 edition of Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan found in the catalog.
Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan
N. King Huber
|Statement||by N. King Huber.|
|Series||The Geology of Isle Royale National Park, Michigan. Geological Survey professional paper, 754-C, Geological Survey professional paper ;, 754-C.|
|Contributions||United States. National Park Service.|
|LC Classifications||QE461 .H89|
|The Physical Object|
|Pagination||iv, C32 p.|
|Number of Pages||32|
|LC Control Number||73600161|
Portage Lake Volcanics; Rhyolite at Bergland: Geologic age: Middle Proterozoic: Lithologic constituents: Major Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow) rhyolite at Bergland MI, part of the Portage Lake Volcanics. References. Portage Lakes is a unique area that lies within the boundaries of Coventry Township and the cities of Green and New Franklin. Within the last century, the communities have gradually moved from agrarian in nature to those of classical developing suburbs. Carolyn Vogenitz lives in Portage Lakes and is the author of the book Portage Lakes Then.
Journals & Books; Help Provenance indicators such as Ti/Zr and Ti/Al ratios and La-Th-Sc ternary diagrams reveal that the Portage Lake Volcanic conglomerates are near-source, and that the Copper Harbor Conglomerate is primarily derived from felsic uplifted basement and recycled orogen lithologies to the east. The Jacobsville Sandstone is a. In the cross-sectional view below, a part of the Portage Lake Volcanics extending SW from Keweenaw Point (right in the figure) to Victoria (left) about 80 miles is shown. Note that conglomerate units are numbered and there are 17 of these among hundreds of lava flows. Thicker lava flows such as the Greenstone flow are shaded.
While the Portage Lake District Library’s meeting room is not currently available, library staff remain committed to serving the community by facilitating connections using Zoom, a virtual meeting service. Read More. Michigan eLibrary Returns. Michigan eLibrary catalog will be available to our library cardholders again, beginning Monday, 8/ The Portage Lake Volcanics consist of 10 km of these sub aerially Geologic section in the Keweenaw peninsula. All rocks are of Keweenawan age (Pre Cambrian) erupted rocks, but only about 5 km is exposed on the Keweenaw peninsula. The period of rift volcanism extended from to Ma, with the Portage Lake Volcanics erupting over a two or.
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USGS: Geological Survey Professional Paper —C (The Portage Lake Volcanics on Isle Royale) Geological Survey Professional Paper —C.
The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan. THE PORTAGE LAKE VOLCANICS ON ISLE ROYALE. GENERAL DESCRIPTION.
The Portage Lake Volcanics on Isle Royale, as on the Keweenaw Peninsula, consists. USGS: Geological Survey Professional Paper —C (The Portage Lake Volcanics on the Keweenaw Peninsula) Geological Survey Professional Paper —C. The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan.
THE PORTAGE LAKE VOLCANICS ON THE KEWEENAW PENINSULA. The middle Keweenawan (Precambrian) Portage Lake Volcanics, in its type area on the. The Portage Lake Volcanics (middle Keweenawan) on Isle Royale, Michigan. Series title. Professional Paper. Series number. Chapter. DOI. /ppC. The Portage Lake Volcanics (PLV) on the Keweenaw Peninsula, Michigan, USA used to host one of most famous and biggest native copper mining areas in the world and are now closed.
The rock sequence is also the locality of the first description of the low-grade metamorphic index mineral pumpellyite (Palache and Vassar, ). Exploration and mining of the native copper deposits in the Cited by: 3.
Top of Portage Lake Volcanics Long w. THOUSANDS No. OF FEET 17 15 14 13 12 9 Hancock ConAlomerate Pewabtc West Con lomerate AilOuez Conglomerate No. Calumet and Hecia Con lomerate Kingston Conglomerate National Sandstone neso erate eoh Conglomerate st. conglomerate Of local u Baltic Conglomerate stratigraphic Of 30 MILES Houghton Conglomerate.
Portage Lake Volcanic Series - ophitic basalt of the Scales Creek Flow, ~ billion years. Portage Lake Volcanics book basalt, or ophite, refers to a mafic igneous rock having individual plagioclase crystals enclosed within pyroxene (this feature can be seen in thin section).Roadcut on southern side of Seventh Street, miles west of Agate Street-Seventh Street intersection, city of Houghton, Keweenaw.
Portage Lake Volcanics: Geologic age: Middle Proterozoic: Lithologic constituents: Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow) Lava flows, mostly basalt, andesite and felsite flows and subordinate interflow sedimentary rocks. Minor. Mineral Search Search Google. The Portage Lake Volcanics (PLV) are the host rock unit for both native and sulfide copper deposits.
The total thickness of the PLV is about 10 kilometers, of which 5 kilometers are exposed on the Keweenaw Peninsula (Cannon, ). The Portage Lake Volcanics consist of over subaerial flood basalt lava flows with occasional interflow sediment layers (Bornhorst, ).
We studied the effects of hydrothermal alteration on magnetic properties of the magnetite and hematite components in the Ga Portage Lake Volcanics, Upper Peninsula, Michigan.
Results show the importance of the intensity and direction of the hematite magnetization in the detection of secondary magnetite overprints in basalts. The Portage Lake Volcanics on Isle Royale and on the Keweenaw Peninsula represent only the upper part of the total Keweenawan volcanic sequence in the Lake Superior region.
The lower part of the sequence is exposed in the so-called South Trap Range of westernmost Michigan and along the north shore of Lake Superior in Minnesota and Ontario. Portage Lake Volcanics extended from MI to WI, as shown in fig. 2, a map of westernmost MI and adjacent WI. Differs from underlying lower Keweenawan Kallander Creek Formation (new) in structural attitude, geographic distribution, residual magnetic polarity and.
(Portage Lake Volcanics) in sections A-A', B-B', and C-C'). Near the rift axis the flow sequence is as much as 20 km thick but has a maximum thickness of about 10 km in the map area (Cannon and others, ).
The upper part of the supergroup is predominantly sed. Additional Physical Format: Online version: Huber, N. King (Norman King), Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan. The Portage Lake Volcanics on the Keweenaw Peninsula. The Portage Lake Volcanics on Isle Royale. General description Volcanic rocks Classification and nomenclature Composition Stratigraphic units Porphyrite flows Scoville Point, Middle Point, and.
Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan / by Suzanne W.
Nicholson. The Portage Lake Volcanics (Middle Keweenawan) on Isle Royale, Michigan: STRUCTURE. The layered bedrock sequence on Isle Royale is tilted toward the southeast.
Dips of the strata range from less than 10° to 55°; they are generally steeper on the north side of the island than on the south side and average less than 20°. The increase in dip. The Portage Lake Volcanics consists primarily of lava flows; minor sedimentary rocks, similar to those within the Copper Harbor Conglomerate, are intercalated between flows (hereafter referred to as interflow sedimentary rocks).
The transition between the two formations reflects a gradual cessation of volcanic activity and the growing dominance. Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keweenaw Peninsula, Michigan / by Suzanne W.
Nicholson. Reviews User-contributed reviews. A lower age limit for the sandstone is established from large basalt clasts derived probably from the Portage Lake Volcanics, and from the occurrence of the sandstone as dikes in the volcanics.
The upper age is based on its position below the late Cambrian Munising Sandstone. A geologic map of Isle Royale National Park at a scale ofpublished separately (Huber, b), provides details of the distribution and structure of the Portage Lake Volcanics not possible to show at the scale of maps in the present report, and it is recommended that that map be used in.
The Portage Lake Volcanics on Isle Royale represents, as noted, the uppermost part of the Keweenawan volcanic sequence on the north side of Lake Superior, and the North Shore Volcanic Group of Green () and the Osler Group represent the lowermost part.Portage Lake Volcanics of Keweenawan Supergroup (MI) Portage Lake Volcanics of Bergland Group of Keweenawan Supergroup (MI*,WI*) Geologic age: Middle Proterozoic* Type section, locality, area and/or origin of name: 10 mi south of Ahmeek quadrangle, Houghton Co., northwestern MI (Upper Peninsula).
Named from Portage Lake (White and others, ).If secondary rotation has affected the sedimentary rocks, then underlying volcanic rocks should also demonstrate a similar rotation. Thirty-one sites were collected from the Portage Lake Volcanics in the most highly curved part of the Keweenaw Peninsula in the Upper Peninsula of Michigan.