{"private": false, "num_tags": 6, "id": "7deaaace-33c2-4a32-bd73-4d2cc1bb217f", "metadata_created": "2014-05-19T17:01:48.891419", "metadata_modified": "2014-05-19T17:05:23.750663", "author": "Richard P. Nickelsen", "state": "active", "creator_user_id": "d145d0e3-de8c-416e-9681-f2390bd5c946", "type": "dataset", "resources": [{"rating": null, "cache_last_updated": null, "revision_timestamp": "May 19, 2014, 13:02:29 (EDT)", "package_id": "7deaaace-33c2-4a32-bd73-4d2cc1bb217f", "refSystem": "", "file": "", "owner": "admin", "datastore_active": false, "id": "c5524874-bb0d-4a3c-88d0-f3653663fa93", "size": 1501514, "categories_json": "[]", "scale": "", "state": "active", "locations_json": "[]", "last_modified": null, "hash": "", "description": "A Journal of Structural Geology publication by Richard P. Nickelsen.", "format": "PDF", "mimetype_inner": null, "folder_id": "root", "url_type": "upload", "recycle_removed": false, "mimetype": null, "cache_url": null, "typeofgep": "Not Applicable", "name": "Nickelson, 1986.pdf", "created": "2014-05-19T13:02:29.699542", "url": "https://edx.netl.doe.gov/storage/f/edx/2014/05/2014-05-19T17:00:18.126Z/57ae0ad3-6a29-4736-bfb3-57d1b0ad630c/nickelson-1986.pdf", "owner_org": null, "license_type": "cc-by", "position": 0, "revision_id": "cab03543-837d-14bd-437a-b89ebfbee99a", "resource_type": "file.upload"}], "num_resources": 1, "tags": [{"vocabulary_id": null, "state": "active", "display_name": "Appalachian Foreland", "id": "3c94cbde-a1db-4332-a9e8-d52846795cdd", "name": "Appalachian Foreland"}, {"vocabulary_id": null, "state": "active", "display_name": "Cleavage Duplex", "id": "6b1d507d-5c19-482b-9452-1282d05c4daa", "name": "Cleavage Duplex"}, {"vocabulary_id": null, "state": "active", "display_name": "Geology", "id": "b8d42824-d747-4c8e-92b6-6cf01b7b64fa", "name": "Geology"}, {"vocabulary_id": null, "state": "active", "display_name": "Marcellus Shale", "id": "87801c80-3c70-45c1-abdc-f7c31d2ecc09", "name": "Marcellus Shale"}, {"vocabulary_id": null, "state": "active", "display_name": "Structural", "id": "762fe3b9-a4a6-4588-b5ae-9b118a9cbd47", "name": "Structural"}, {"vocabulary_id": null, "state": "active", "display_name": "task 9", "id": "5f8322fc-0593-4163-8540-c84b504f8149", "name": "task 9"}], "title": "Cleavage Duplexes in the Marcellus Shale of the Appalachian Foreland", "groups": [{"display_name": "Unconventional Resources ", "description": "This group contains information relevant to unconventional resources research, with a specific focus in the Marcellus shale formation. All members of the group can add data sets and relevant information to the group. Relevant information includes links to external websites, articles, and data. To become a member of the group, just click the \"follow\" button, and please add anything that you think would be a useful resource to others interested in unconventional resources and the Marcellus shale. ", "image_display_url": "https://edx.netl.doe.gov/groups/unconventional-resources/2019-01-30T10:30:36.608357.png", "title": "Unconventional Resources ", "id": "3e6be9de-3b5b-4f96-bc3d-f48c8b64cb18", "name": "unconventional-resources"}], "license_id": "cc-by", "package_reviewed": true, "name": "cleavage-duplexes-in-the-marcellus-shale-of-the-appalachian-foreland", "isopen": true, "notes": "Cleavage duplexes are zones of platy, spaced cleavage, that either parallel bedding or ramp through shale sections. Examples are 2-60 m thick. The cleavage within the zones is generally subperpendicular to the zone boundaries but sigmoidally dragged against floor, roof and internal thrusts. Between the well-developed floor thrust and the more obscure roof thrusts of the duplexes the shale has been shortened >30% perpendicular to cleavage. The thrusts are sharp strain discontinuities because both overlying and underlying shale is uncleared and less deformed (< 10% layer parallel shortening). Cleavage in the duplexes was initiated perpendicular to bedding by pure shear in front of a propagating tip line. Cleavage halos at the ends of associated stiff carbonate concretions are small scale models illustrating initiation of cleavage. The cleavage is a primary crenulation cleavage with dissolution of limbs indicated by clay carbon partings. Transfer of thrusting from the floor to the roof of the cleavage duplex proceeded incrementally toward the foreland, imposing the simple shear that led to\r\nsigmoidal cleavage traces as the cleavage continuously evolved. Environmental conditions for formation of cleavage duplexes during the Alleghanian Orogeny are estimated as temperature 200-250\u00b0C, and pressure 1.1-1.3 kb, based upon conodont coloration (CAI 4), fluid inclusions and restored stratigraphic thicknesses. Cleavage duplexes or similar fold duplexes have been recognized in suitable black shales of Ordovician to Carboniferous age. They are manifestations of the progressive transfer of slip from floor to roof through a disturbed zone that serves as a shear boundary between large, more internally passive, thrust sheets.", "license_title": "Creative Commons Attribution", "extras": [{"key": "netl_product", "value": "no"}, {"key": "organization", "value": "Department of Geology, Bucknell Univeristy"}, {"key": "organization_acronym", "value": "B"}, {"key": "publication_date", "value": "1985-08-29"}, {"key": "spatial", "value": "{\"type\":\"MultiPolygon\",\"coordinates\":[[[[-75.76171875,42.19596877629178],[-75.76171875,38.03078569382294],[-81.6064453125,38.03078569382294],[-81.6064453125,42.19596877629178],[-75.76171875,42.19596877629178]]]]}"}], "license_url": "http://www.opendefinition.org/licenses/cc-by", "revision_id": "fca32801-edc9-44c7-8f8e-69eaad70c36e"}