[
    {
        "id": "authors:0hz6s-s9361",
        "collection": "authors",
        "collection_id": "0hz6s-s9361",
        "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140422-074216122",
        "type": "book_section",
        "title": "Relation of the Puertecitos Volcanic Province, Baja California, Mexico, to development of the plate boundary in the Gulf of California",
        "book_title": "Cenozoic Tectonics and Volcanism of Mexico",
        "author": [
            {
                "family_name": "Stock",
                "given_name": "Joann M.",
                "orcid": "0000-0003-4816-7865",
                "clpid": "Stock-J-M"
            }
        ],
        "contributor": [
            {
                "family_name": "Delgado-Granados",
                "given_name": "Hugo",
                "clpid": "Delgado-Granados-H"
            },
            {
                "family_name": "Aguirre-D\u00edaz",
                "given_name": "Gerardo J.",
                "clpid": "Aguirre-D\u00edaz-G-J"
            },
            {
                "family_name": "Stock",
                "given_name": "J. M.",
                "clpid": "Stock-J-M"
            }
        ],
        "abstract": "The Puertecitos Volcanic Province is a late Miocene and Pliocene ignimbrite field\ncovering an area of ~2600 km^2, with an estimated erupted volume of at least 500 km^3. It\nis unique on the Baja California Peninsula in terms of both its volume and age. It lies at\na 35\u00b0 bend in the edge of the Gulf of California rift system, at a location where the character\nof the Gulf extensional province, in terms of topography, style of faulting, and\npaleomagnetic rotations, changes dramatically along strike.\nThis chapter presents a speculative model linking the along-strike structural variations\nof the extensional province at this location, and the two major episodes of volcanism\nin the Puertecitos Volcanic Province ca. 6 Ma and 3 Ma, to events in the\nevolution of the spreading and transform system nearby in the Gulf of California. Two\nfracture zone systems project northwestward into the Puertecitos Volcanic Province.\nThe Guaymas transform fault system passes through the Ballenas Channel and is\naligned with the southern boundary of the volcanic province; the Tibur\u00f3n fracture\nzone (between Isla Tibur\u00f3n and Isla Angel de la Guarda) projects into the northcentral\npart of the province. The Tibur\u00f3n fracture zone was important during the\nearly evolution of the Gulf of California. The Guaymas transform fault system was\nmuch shorter during the early evolution of the Gulf of California was only active near\nthe Puertecitos Volcanic Province after 2 Ma. The Tibur\u00f3n fracture zone may have\nbeen connected to a west-northwest-trending zone of deformation on land, the\nMatomi accommodation zone. Regional field evidence suggests that this accommoda:\ntion zone was active in late Miocene time and may have localized most of the vents for\nthe voluminous ca. 6 Ma volcanism of the northern Puerteci tos Volcanic Province. An\nepisode of 3.3-2.7 Ma volcanism in the extending region is related to a Pliocene jump\nof one Gulf of California spreading center from the Tibur\u00f3n basin into this area\n(which is now the lower Delfin basin). Continental extension, growth faulting, and\nbasin formation in Pliocene time in the southern part of the Puertecitos Volcanic\nProvince probably preceded this spreading center jump by 1 to 2 m.y.\nThe temporal and spatial aspects of extension in this model may explain the\nstructural transition seen in the Puertecitos region. North of the Puertecitos Volcanic\nProvince, the San Pedro Martir fault and basin and range topography partly reflect\npre-6 Ma extension. Regions to the south, from Puertecitos southward to Gonzaga\nBay, may have been unaffected by extension at this time. The pre-Pliocene rift margin\nprobably passed through the northeast part of the province and southeastward into\nthe Gulf of California, east of Isla Angel de la Guarda. When major deformation began to affect the main part of the volcanic province, the motion in the sector from\nPuertecitos to Gonzaga Bay may have been primarily transform in nature, producing\na very different structural style from that inherited from the earlier transtensional\nhistory in the region north of the Matomi accommodation zone.",
        "doi": "10.1130/0-8137-2334-5.143",
        "isbn": "9780813723341",
        "publisher": "Geological Society of America",
        "place_of_publication": "Boulder, CO",
        "publication_date": "2000",
        "pages": "143-156"
    }
]