Tijeras Greenstone | |
---|---|
Stratigraphic range: | |
Type | Formation |
Unit of | Manzano Group |
Underlies | Bootleg Canyon Sequence |
Lithology | |
Primary | Greenschist |
Location | |
Coordinates | 35°04′48″N106°24′25″W / 35.080°N 106.407°W |
Region | Sandia Mountains, New Mexico |
Country | United States |
Type section | |
Named for | Tijeras Canyon |
Named by | Kelley and Northrop |
Year defined | 1975 |
The Tijeras Greenstone is a geologic formation in central New Mexico. [1] It has a radiometric age of 1660 million years (Ma), corresponding to the Statherian period. [2]
The unit was first defined by V.C. Kelley and S.A. Northrop in 1975. [1] The formation was included in the Manzano Group by Mark Holland and coinvestigators in 2020. [3]
The formation is exposed along a belt 1 mile (1.6 km) and 5.5 miles (8.9 km) long in Tijeras Canyon east of Albuquerque, New Mexico. It is a sequence of metavolcanic and metasedimentary beds, typically dark green in color, with its texture varying from unfoliated to strongly schistose. [1] The dominant rock type is metabasalt of tholeiitic composition. [4] The more foliated beds are chlorite or hornblende schist, but much of the formation is igneous rocks that have experienced only mild metamorphism. Metasedimentary rocks vary from quartzite through mica schist to marble, with one sequence of quartzite beds exceeding 610 meters (2,000 ft) in thickness. [1] Metamorphic conditions reached 550±50 °C and 2±1 kb pressure, corresponding to a low-pressure amphibolite facies. [4]
The Manzano Mountains are a small mountain range in the central part of the U.S. state of New Mexico. They are oriented north–south and are 30 miles long. The center of the range lies due east of the town of Belen. The name "Manzano" is Spanish for "apple tree"; the mountains were named for apple orchards planted at the nearby town of Manzano.
The Manzano Group is a group of geologic formations in central New Mexico. These have radiometric ages of 1601 to 1662 million years (Ma), corresponding to the late Statherian period of the Paleoproterozoic.
The Mazatzal orogeny was an orogenic event in what is now the Southwestern United States from 1650 to 1600 Mya in the Statherian Period of the Paleoproterozoic. Preserved in the rocks of New Mexico and Arizona, it is interpreted as the collision of the 1700-1600 Mya age Mazatzal island arc terrane with the proto-North American continent. This was the second in a series of orogenies within a long-lived convergent boundary along southern Laurentia that ended with the ca. 1200–1000 Mya Grenville orogeny during the final assembly of the supercontinent Rodinia, which ended an 800-million-year episode of convergent boundary tectonism.
The Yavapai orogeny was an orogenic (mountain-building) event in what is now the Southwestern United States that occurred between 1710 and 1680 million years ago (Mya), in the Statherian Period of the Paleoproterozoic. Recorded in the rocks of New Mexico and Arizona, it is interpreted as the collision of the 1800-1700 Mya age Yavapai island arc terrane with the proto-North American continent. This was the first in a series of orogenies within a long-lived convergent boundary along southern Laurentia that ended with the ca. 1200–1000 Mya Grenville orogeny during the final assembly of the supercontinent Rodinia, which ended an 800-million-year episode of convergent boundary tectonism.
The Picuris orogeny was an orogenic event in what is now the Southwestern United States from 1.43 to 1.3 billion years ago in the Calymmian Period of the Mesoproterozoic. The event is named for the Picuris Mountains in northern New Mexico and interpreted either as the suturing of the Granite-Rhyolite crustal province to the southern margin of the proto-North American continent Laurentia or as the final suturing of the Mazatzal crustal province onto Laurentia. According to the former hypothesis, this was the second in a series of orogenies within a long-lived convergent boundary along southern Laurentia that ended with the ca. 1200–1000 Mya Grenville orogeny during the final assembly of the supercontinent Rodinia, which ended an 800-million-year episode of convergent boundary tectonism.
The Ortega Formation is a geologic formation that crops out in most of the mountain ranges of northern New Mexico. Detrital zircon geochronology establishes a maximum age for the formation of 1690-1670 million years (Mya), in the Statherian period of the Precambrian.
The Marquenas Formation is a geological formation that crops out in the Picuris Mountains of northern New Mexico. Detrital zircon geochronology gives it a maximum age of 1435 million years, corresponding to the Calymmian period.
The San Pedro quartz monzonite is a Paleoproterozoic pluton in New Mexico. It has a radiometric age of 1730 Mya, corresponding to the Statherian period.
The San Miguel gneiss is a Paleoproterozoic pluton in the Nacimiento Mountains of New Mexico. It has a radiometric age of 1.695 billion years, corresponding to the Statherian period.
The Joaquin quartz monzonite is a Mesoproterozoic pluton in northern New Mexico. Radiometric dating gives it an age of 1460 million years, corresponding to the Calymmian period.
The Sevilleta Metarhyolite is a geologic formation in central New Mexico. It has a radiometric age of 1665 ± 16 Ma, corresponding to the Statherian period.
The Cibola gneiss is a pluton in central New Mexico. It has a radiometric age of 1653±16 Ma, corresponding to the Statherian period.
The Sandia granite is a pluton in central New Mexico. It has a radiometric age of 1453±12 Ma, corresponding to the Calymmian period.
The Los Pinos Mountains are a small mountain range in the central part of New Mexico, US. They are the southernmost part of a mountain front, running north to south, that also includes the Sandia Mountains and the Manzano Mountains. The Los Pinos Mountains are separated from the Manzano Mountains by Abo Pass, which was cut by a small tributary to the Rio Grande. The mountains run slightly west of south for 15 miles (24 km) and widen to a maximum of about 4 miles (6.4 km) across before narrowing again. The southern end of the range is ill-defined, being marked by cuestas that merge into badlands to the south.
The White Ridge Quartzite is a geologic formation in central New Mexico. It has a maximum age of 1650 million years (Ma), corresponding to the Statherian period.
The Blue Springs Formation is a geologic formation exposed in the Los Pinos Mountains of central New Mexico.
The Sais Quartzite is a geologic formation exposed in the Los Pinos Mountains of central New Mexico.
The Abajo Formation is a geologic formation in the Los Pinos Mountains of central New Mexico. It was deposited about 1660 million years (Ma) ago, corresponding to the Statherian period.
The Irving Formation is a Precambrian geologic formation found in the San Juan Mountains of southwest Colorado, US. It is thought to be Statherian in age
The White Ledges Formation is a geologic formation that crops out in central Arizona, US. Detrital zircon geochronology establishes a maximum age for the formation of 1726 million years (Mya), in the Statherian period of the Precambrian. The formation is typical of quartzites deposited around 1650 million years ago in the southwestern part of Laurentia, the ancient core of the North American continent.