Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México
The Las Cruces intrusive suite is located at the southern extent of the Baja California Peninsula in northwestern Mexico. The suite constitutes the northern part of the Los Cabos Batholitic Complex. It is correlated with extensive Cretaceous magmatic activity extending across California and the Baja...
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2024-11-01
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| author | Ernesto Ramos-Velázquez Raúl E. Lugo-Zazueta Jobst Wurl Miguel A. Imaz-Lamadrid Tomás I. Grijalva Rodríguez |
| author_facet | Ernesto Ramos-Velázquez Raúl E. Lugo-Zazueta Jobst Wurl Miguel A. Imaz-Lamadrid Tomás I. Grijalva Rodríguez |
| author_sort | Ernesto Ramos-Velázquez |
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| description | The Las Cruces intrusive suite is located at the southern extent of the Baja California Peninsula in northwestern Mexico. The suite constitutes the northern part of the Los Cabos Batholitic Complex. It is correlated with extensive Cretaceous magmatic activity extending across California and the Baja Peninsula, known as the Peninsular Ranges Batholith. Despite its significance for understanding the regional tectonic and magmatic evolution, detailed information to fully support this correlation remains limited. This work provides new cartographic and structural data of the units comprising the intrusive suite and the temporal relationships between lithological units, supported by U-Pb zircon geochronology. The suite consists of granite in its central part, tonalite displaying magmatic foliation at its NW and SE margins, and two gabbro apophyses along the western edge. The host rocks consist of intercalations of hornblende and biotite schists, forming screens and roof pendants. Late magmatic felsic dikes, derived from the granite, intrude into the suite units. Five new U-Pb zircon age determinations indicate that the suite has a normal crystallization history with ages from 103.5 ± 1.2 to 97.6 ± 0.8 Ma for the tonalite and from 93.6 ± 0.7 to 95.0 ± 0.9 Ma for the granite. The gabbro is the oldest intrusive unit, with previous U-Pb zircon ages reported near 109 ± 2.3 and 102.3 ± 2.9 Ma. Structural analysis indicates that the gabbro and tonalite were emplaced during an E–W synmagmatic compressional event, evidenced by N–S oriented magmatic foliation, aligning subparallel to the granite and metasedimentary screens contacts. Later, the granite was emplaced during a compressional stress relaxation phase, causing the tonalite dissection and forming the current suite margins. The calculated U-Pb ages for the Las Cruces intrusive suite and reported geochemical and geophysical data from the northern Baja California Peninsula support its correlation with the Peninsular Ranges batholith. |
| format | Article |
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| institution | Kabale University |
| issn | 2076-3263 |
| language | English |
| publishDate | 2024-11-01 |
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| spelling | doaj-art-0b5a00a832b54182b1d3ff58e82cdc4d2024-12-27T14:28:16ZengMDPI AGGeosciences2076-32632024-11-01141232210.3390/geosciences14120322Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., MéxicoErnesto Ramos-Velázquez0Raúl E. Lugo-Zazueta1Jobst Wurl2Miguel A. Imaz-Lamadrid3Tomás I. Grijalva Rodríguez4Departamento Académico de Ciencias de la Tierra, Universidad Autónoma de Baja California Sur, A.P. 19-B, La Paz C.P. 23080, Baja California Sur, MexicoDepartamento de Geología, Universidad de Sonora, Hermosillo C.P. 83000, Sonora, MexicoDepartamento Académico de Ciencias de la Tierra, Universidad Autónoma de Baja California Sur, A.P. 19-B, La Paz C.P. 23080, Baja California Sur, MexicoDepartamento Académico de Ingeniería en Pesquerías, Universidad Autónoma de Baja California Sur, A.P. 19-B, La Paz C.P. 23080, Baja California Sur, MexicoDepartamento Académico de Ciencias de la Tierra, Universidad Autónoma de Baja California Sur, A.P. 19-B, La Paz C.P. 23080, Baja California Sur, MexicoThe Las Cruces intrusive suite is located at the southern extent of the Baja California Peninsula in northwestern Mexico. The suite constitutes the northern part of the Los Cabos Batholitic Complex. It is correlated with extensive Cretaceous magmatic activity extending across California and the Baja Peninsula, known as the Peninsular Ranges Batholith. Despite its significance for understanding the regional tectonic and magmatic evolution, detailed information to fully support this correlation remains limited. This work provides new cartographic and structural data of the units comprising the intrusive suite and the temporal relationships between lithological units, supported by U-Pb zircon geochronology. The suite consists of granite in its central part, tonalite displaying magmatic foliation at its NW and SE margins, and two gabbro apophyses along the western edge. The host rocks consist of intercalations of hornblende and biotite schists, forming screens and roof pendants. Late magmatic felsic dikes, derived from the granite, intrude into the suite units. Five new U-Pb zircon age determinations indicate that the suite has a normal crystallization history with ages from 103.5 ± 1.2 to 97.6 ± 0.8 Ma for the tonalite and from 93.6 ± 0.7 to 95.0 ± 0.9 Ma for the granite. The gabbro is the oldest intrusive unit, with previous U-Pb zircon ages reported near 109 ± 2.3 and 102.3 ± 2.9 Ma. Structural analysis indicates that the gabbro and tonalite were emplaced during an E–W synmagmatic compressional event, evidenced by N–S oriented magmatic foliation, aligning subparallel to the granite and metasedimentary screens contacts. Later, the granite was emplaced during a compressional stress relaxation phase, causing the tonalite dissection and forming the current suite margins. The calculated U-Pb ages for the Las Cruces intrusive suite and reported geochemical and geophysical data from the northern Baja California Peninsula support its correlation with the Peninsular Ranges batholith.https://www.mdpi.com/2076-3263/14/12/322geochronologyU-PbLas Cruces intrusive suitePeninsular Ranges batholith |
| spellingShingle | Ernesto Ramos-Velázquez Raúl E. Lugo-Zazueta Jobst Wurl Miguel A. Imaz-Lamadrid Tomás I. Grijalva Rodríguez Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México Geosciences geochronology U-Pb Las Cruces intrusive suite Peninsular Ranges batholith |
| title | Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México |
| title_full | Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México |
| title_fullStr | Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México |
| title_full_unstemmed | Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México |
| title_short | Geology and Zircon U-Pb Geochronology of the Las Cruces Intrusive Suite, B.C.S., México |
| title_sort | geology and zircon u pb geochronology of the las cruces intrusive suite b c s mexico |
| topic | geochronology U-Pb Las Cruces intrusive suite Peninsular Ranges batholith |
| url | https://www.mdpi.com/2076-3263/14/12/322 |
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