Lake Estancia

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Coordinates: 35°N 106°W / 35°N 106°W / 35; -106
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Lake Estancia
Estancia Valley, New Mexico
Coordinates35°N 106°W / 35°N 106°W / 35; -106
Typeformer lake
Max. length56 kilometres (35 miles)
Max. width37 kilometres (23 miles)

Lake Estancia was a lake formed in the

Estancia Valley, central New Mexico, which left various coastal landforms in the valley. The lake was mostly fed by creek and groundwater from the Manzano Mountains, and fluctuated between freshwater stages and saltier stages. The lake had a diverse fauna, including cutthroat trout
; they may have reached it during a possible past stage where it was overflowing.

Lake Estancia appears to have formed between the

playas
(dry lake beds).

The lake was one of several

paleoclimatic
record.

History and climatological implications

The Estancia Valley became a

Yeso Formation may have contributed to the subsidence of the basin.[7]

The low thickness of lake sediments in the Estancia Valley suggests that the lake began to form only in the middle Pleistocene.

insolation and warm periods in Greenland; however, problems with dating these fluctuations make any inference about correlations to events elsewhere in North America problematic.[11]

Last Glacial Maximum and later

The lake sediment record indicates that shallow lakes re-formed between 45,000 and 40,000 years ago. Water levels began to rise 24,000 years ago,[12] and at least five highstands occurred during the LGM,[13] with two more before and after the LGM.[14] At least ten separate oscillations in water levels took place.[15] Radiocarbon dating has yielded ages of 24,300 years ago for the first freshwater stage and 20,040 for the gap between the second and third freshwater stage.[16] The expansion of lakes during the LGM was triggered by the growth of the Laurentide Ice Sheet, which forced the jet stream southward.[15] A highstand around 23,000 years ago appears to coincide with Heinrich event 2,[17] an episode in the North Atlantic where ice discharge into the ocean was increased and impeded heat transport by ocean currents.[18]

The highstands lasted until 18,100–17,000 years ago when water levels declined,

North Atlantic but it is not clear how ice-rafting events could simultaneously trigger the beginning and the end of a dry episode.[21] Possibly, the southward migration of the Intertropical Convergence Zone during the "Big Dry" cooled the northeastern Pacific, inducing drought despite the occurrence of a more winter-like atmospheric circulation over North America, which would be expected to increase precipitation.[11] Later research has proposed that the end of the "Big Dry" may relate to the ice-rafting events, given chronological uncertainties.[25]

Another highstand took place after the "Big Dry"

Arctic sea ice to expand and Antarctic sea ice to contract,[31] causing a southward migration of the Intertropical Convergence Zone.[32] The forcing by the Laurentide Ice Sheet was important for the Mystery Interval lake level changes as well.[33] The highstand between 16,100 and 14,500 years ago has been christened the "Big Wet".[26]

There were two more highstands 14,000–12,500 years ago, followed by desiccation 12,000[34] or 14,000 years ago[14] when the lake declined over the course of a millennium.[34] This decline of water levels was a consequence of a drier climate in the Southwestern United States,[11] the so-called "Clovis-age drought",[35] and relates to the Bølling-Allerød period, a time period where climate changed.[11] The exposed lake bed was eroded by wind, producing dunes.[14] "Lake Willard",[36] the final highstand at about 1,860 meters (6,100 feet) elevation, has been linked to the Younger Dryas[37][14] when a moister climate returned to the Southwestern United States.[11] It took place 11,000–10,000 years ago and was short lived.[34] Ridges on the eastern side of the Estancia Valley formed during this highstand.[38]

Similarities have been noted between the record of Lake Estancia and that of Lake Cochise in Arizona, Lake Mojave in California[39] and San Luis Lake in Colorado.[40] The timing of Lake Estancia highstands is coherent with the timing of highstands in other Great Basin lakes.[41] Water levels at other Great Basin lakes too declined with the Bølling-Allerød period[42] and concomitant abrupt global climate change.[43] Conversely, the water level changes at Lake Estancia are opposite to lake-level fluctuations at low latitudes.[44] Lake level rises probably took only a few decades.[45] Fluctuations in water levels occurred secondarily to changes in the atmospheric moisture transport.[44]

Short term changes

Millennial-scale oscillations are documented from lake deposits,

Gleissberg solar cycle have been proposed as explanation for these fluctuations.[52]

Holocene

Beach terraces and other beach deposits were emplaced early in the Holocene;

Altithermal climate phase.[60] Dunes developed during hot and dry conditions of the middle Holocene.[61] After the middle Holocene the climate became wetter again, reducing dune activity.[14] The existence of a "Lake Meinzer" with a depth of 20 meters (66 feet) and an area of 520 square kilometres (200 square miles) after the Altithermal has been inferred.[62] Presently, dry lakes occur on the bed of Lake Estancia and are fed by groundwater.[63]

Geography and geomorphology

Lake Estancia developed within the

Albuquerque.[65] Interstate 40 crosses the northernmost parts of the lakebed of Lake Estancia, and New Mexico State Road 41 and U.S. Route 60 pass over the western and southern lakebed, respectively;[7] formerly the tracks of the New Mexico Central Railroad and the Atchison, Topeka and Santa Fe Railway also traversed the lake bed.[66] The lowest units of the Salinas Pueblo Missions National Monument are located close to the shorelines of former Lake Estancia.[67]

Estancia Valley covers an area of 5,000 square kilometres (1,900 square miles)[13] and is flanked to the east by the Pedernal Hills,[68] to the northwest by the Sandia Mountains, to the west by the Manzano Mountains, to the south by the Juames Mesa[69] and Chupadera Mesa[37] and to the southeast by the Rattlesnake Hills.[69] The Estancia Basin is near the Rio Grande-Pecos River drainage divide.[70]

The central points of the valley contain over sixty

playas,[71] which formed within blowouts; the largest is Laguna del Perro and others include Laguna Chica and Laguna Salina.[72] They hold water only briefly[73] and are not remnants of Lake Estancia.[74] The lowermost point of the valley lies at 1,850 meters (6,070 feet) elevation.[13]

The lake

At its greatest extent,[75] the lake was about 56 kilometres (35 miles) by 37 kilometres (23 miles) wide[76] and covered the present-day locations of Estancia, McIntosh, Progresso and Willard.[75] The lake may have resembled Lake Tahoe in California, although Lake Tahoe is deeper.[77] Lake Estancia was the easternmost pluvial lake in Southwestern North America.[78]

Distinct shoreline landforms in the Estancia Valley occur at various elevations, including bars, beaches,[79][80] gravel deposits, ridges,[81] scarps,[82] spits,[79] swales,[81] terraces and wave-cut cliffs.[79] A spit protruded northward into a bay on Lake Estancia's eastern shore.[7] On the eastern side of Lake Estancia is a gypsum ridge about 3 meters (9.8 feet) high and 20 kilometres (12 miles) long, and smaller ridges are found elsewhere.[83] These features are subdivided into an "older", less well developed shoreline at higher elevations and a "younger", better developed shoreline at lower elevations.[79] Most shoreline deposits were formed by the accumulation of material; only in a few places did the lake actively erode pre-existing terrain.[84]

Water levels may have reached 1,939 meters (6,362 feet) above sea level during the early Lake Estancia stage, 1,897 meters (6,224 feet) during the late Lake Estancia stage and possibly 1,870 meters (6,140 feet) during the "Lake Willard" stage,[69] a late highstand.[85] At maximum elevation the lake would have covered 2,340 square kilometres (900 square miles) and been 125 meters (410 feet) deep,[9] while the Wisconsin-age lake was only 50 meters (160 feet) deep with an area of 1,170 square kilometres (450 square miles) and "Lake Willard" may have reached 20 meters (66 feet) depth and 610 square kilometres (240 square miles) surface area, although the estimated elevation is uncertain.[86] During low water level stages shallow water or marshes covered the floor of Lake Estancia.[12] Beach ridges from a last filling of the lake are found at the eastern edge of the lake floor.[34]

Channels of streams reach the higher shorelines and less recognizable channels continue to lower shorelines.

beach bars.[88] On the western side of the lake, at Manzano Draw and Buffalo Draw there are deposits of deltas; Manzano Draw generated a fan delta on one of the lower shorelines.[7] Another channel entering Lake Estancia was Torreon Creek.[89] Debris was transported from the Manzano Mountains into the lake during highstands.[37]

Lake deposits and post-lake dunes

The lake deposited flint-gray clay[90] and gypsum during its high water level stages.[91] Deposits from lake level rises have been classified as a geological formation, the Dog Lake Formation.[92] During low water level stages, sulfate-rich groundwater formed gypsum,[55] which together with silt constitutes the low-stand deposits.[90] During low water level stages playa deposits and flood sediments accumulated in the dry lake bed,[16] forming among other things the so-called "Estancia Playa Complex".[93]

The Estancia Dune Field is a 120 square kilometres (46 square miles) dune field in Estancia Valley.[38] It consists of gypsum dunes, a rare type of dunes.[94] These dunes were generated when the lake dried up and gypsum was blown away by the wind.[95][38] Wind-driven excavation of the dry lakebed has produced a scarp,[96] lunette dunes,[f][82] dome-shaped landforms and crescent-shaped ridges.[38]

Hydrology

The lake was fed by a centripetal pattern of streams and by groundwater, with highstands being fed mainly by streams and low water level stages by groundwater. The Manzano Mountains were its main water source[37] but there were no glaciers in its watershed.[98] The total watershed of Lake Estancia had an area of about 5,050 square kilometres (1,950 square miles), about 22% of which were occupied by the lake during the late Wisconsin glaciation.[63] This is a large proportion of the watershed, a consequence of the high elevation of Lake Estancia which resulted in lower temperatures and thus slower evaporation than lakes at lower elevation.[99] The water ultimately originated from the Pacific Ocean and westerly winds transported it to Lake Estancia.[48] Groundwater discharge buffered the lake against climatic variations.[100]

Leakage of groundwater out of the lake may have become significant at high water levels, thus stabilizing various highstands at a similar elevation around 1,890 metres (6,200 feet) when the amount of groundwater leaking out matched that of inflowing water.[37] In particular, water may have leaked along groundwater pathways[92] and the Chupadera Fault southwards into the Tularosa Basin during the Wisconsin glaciation, stabilizing Lake Estancia's water levels at about 1,900 metres (6,200 feet)[34] despite the progressive infilling of the lake basin.[49]

The lake was at times hypersaline and at times freshwater. This was confirmed by

oligotrophic [86] and reached temperatures of 10 degrees Celsius (50 degrees Fahrenheit).[102] Strong winds and the shallow depth of the lake prevented its waters from becoming stratified[103] and it has been inferred that Lake Estancia featured bottom currents.[104] Silty water might have reached large distances from the shoreline, depositing its silt far into Lake Estancia.[105] The gypsum in the lake deposits may have formed on the shoreline and was transported into Lake Estancia by winds.[106]

Overflow

A broad saddle at 1,932 meters (6,339 feet) elevation separates the Estancia basin from the Pinos Wells basin to the south. Initial research did not encounter shoreline landforms at the elevation of this sill and thus concluded that no overflow took place, but in the mid-20th century traces of a former shoreline were found above the sill elevation.[79] Further late-20th century research did not find evidence of shorelines at overflow elevation[107] or of flow at the supposed sill.[92][108] The lake probably did not overflow during the Wisconsin glaciation;[5] if there was overflow it took place over 130,000 years ago.[45]

If Lake Estancia overflowed under maximum highstands,

closed lakes[111] although evidence for the existence of such a lake in the Pinos Wells basin is scant.[8] The sill limiting Lake Estancia's height was probably downcut if it ever carried water.[109]

Climate

Today, the mean temperature of the valley is about 10 degrees Celsius (50 degrees Fahrenheit). Precipitation is less than 300 millimetres per year (12 inches per year) and much less than the annual evaporation rate of 1,520 millimetres per year (60 inches per year). Thus, permanent lakes cannot exist in the Estancia Valley under present-day conditions.

North American Monsoon during summer, which deliver moisture coming from the Gulf of California, Gulf of Mexico and the Pacific Ocean.[13] Precipitation occurs in comparable quantities both in summer and winter but, given the high summer evaporation rates,[112] runoff and groundwater recharge occurs mainly during winter.[14]

Precipitation and vegetation were different in New Mexico during the ice ages, when Lake Estancia existed.

El Nino-Southern Oscillation, the effects of solar cycles and variations of the Laurentide Ice Sheet controlled the climate of the Southwestern United States during the Pleistocene and Holocene.[115]

Lake Estancia is only one among several lakes in New Mexico that formed or expanded

tropical lakes had shrunk but water levels in lakes of Southwestern North America and Northern Africa rose. Rising water levels in Southwestern North America – including Lake Estancia – have been variously attributed either to increased precipitation from storm track changes induced by continental glaciation or to decreased evaporation. The exact timing of the highstands of Lake Estancia – during the LGM or during a warmer wetter period after the LGM – has also been debated.[116]

Biota

Equus occidentalis skeleton

The fossil animal fauna at Lake Estancia is represented by Rancholabrean[h] species. Fossils include ducks, the large horse Equus occidentalis[118] and tiger salamander.[16] There were mammoths at the lake, either after it dried up[119] or during the "Lake Willard" stage.[85] Based on pollen data, sagebrush grassland occurred around Lake Estancia, with pine-spruce woodland in the Manzano Mountains.[120] Increased water availability probably allowed grazing animals to thrive around the lake.[121]

Various fossils have been found in lake deposits, including

stonewort grew in the wet soils and saltwater.[16][122] Vegetation around the lake may have consisted of open parkland.[123]

Fossils of

captured by the Rio Grande and Pecos River.[92]

Anthropology and scientific importance

Humans first arrived in the Estancia Basin during a period where Lake Estancia was dry,

Pueblo people traded with salt from the lake basin[133] and there were disputes between the Church and State in the 1660s about its exploitation.[134]

Research history and scientific significance

Evidence of the existence of former lakes in the Estancia Valley was first reported in 1903.

Drill cores in lake sediments, landforms formed on the former shoreline and outcrops have yielded evidence of the basin's history, going back to the Illinoian glaciation.[135][79] The paleoclimatic record of Lake Estancia is the best-studied in New Mexico,[136] although different conclusions about precipitation and temperature during the ice age have been drawn from it.[137] Compared to climatic records elsewhere in the Great Basin, the paleoclimate record of Lake Estancia is remarkably well preserved and has been used to infer general climate trends in the region[14] as its large size allowed Lake Estancia to respond to regional climate changes.[104] It also has a higher resolution and greater length than many other paleoclimate records.[138] In contrast, little archeological research has focused on the lake's effects on human populations.[134]

Older research published in 1989 indicates that during the early and middle Wisconsin glaciation, there was no freshwater lake in the Estancia Valley. Rather, saline and swampy environments were recorded from drill cores. Lake Estancia would have formed during the late Wisconsin as a saline lake and would have gone through three separate freshwater stages[79] which would be part of the late Lake Estancia superstage. This third freshwater stage would have been the longest-lasting, followed by another freshwater stage, the "Lake Willard" stage, after a period of more saline conditions.[16] The "Lake Willard" stage has yielded a date of 12,460 years; prior to this dating effort "Lake Willard" was considered to be about 8,000 years old and thus of Holocene age.[16]

Notes

  1. ^ a b The period of time between 5.333 and 2.58 million years ago.[1]
  2. ^ a b The period of time between 2.58 and 0.0117 million years ago.[1]
  3. ^ The time period between 11,700 years ago and today.[1]
  4. ^ Pluvial lakes are former lakes that developed during the ice ages and are now dry.[2]
  5. ^ A closed basin is a drainage system that ends in a lake or depression, with evaporation being the only means through which water leaves the system.[3]
  6. ^ Lunette dunes are bow-shaped dunes that form downwind of dry lakes, when winds blow material from the dry lake bed and deposit it in these dunes.[97]
  7. ^ Generally, the area of such lakes is the function of the inflow/recharge of the lake basin minus any leakage divided through the evaporation rate.[63]
  8. ^ The Rancholabrean is a stratigraphical unit based on a characteristic land mammal fauna which lived at the time of the human settlement of North America.[117]
  9. ^ Projectile points or points are the objects such as rocks that form the tip of an arrow. They are useful when reconstructing the cultural history.[128]
  10. Paleoindians between 11,000–10,200 years ago.[129]

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Sources

External links
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