Mount Berlin is a
glacier-covered
volcano in
Marie Byrd Land,
Antarctica, 100 kilometres (62 mi) from the
Amundsen Sea. It is a roughly 20-kilometre-wide (12 mi) mountain with
parasitic vents that consists of two coalesced volcanoes: Berlin proper with the 2-kilometre-wide (1.2 mi) Berlin Crater and
Merrem Peak with a 2.5-by-1-kilometre-wide (1.55 mi × 0.62 mi) crater, 3.5 kilometres (2.2 mi) away from Berlin. The summit of the volcano is 3,478 metres (11,411 ft) above sea level. It has a volume of 200 cubic kilometres (48 cu mi) and rises from the
West Antarctic Ice Sheet. It is part of the
Marie Byrd Land Volcanic Province.
Trachyte is the dominant
volcanic rock and occurs in the form of
lava flows and
pyroclastic rocks.
The volcano began erupting during the
Pliocene and was active into the late
Pleistocene and the
Holocene. Several
tephra[a] layers encountered in
ice cores all over Antarctica – but in particular at
Mount Moulton – have been linked to Mount Berlin, which is the most important source of such tephras in the region. The tephra layers were formed by
explosive eruptions that generated high
eruption columns. Presently,
fumarolic activity occurs at Mount Berlin and forms
ice towers from freezing steam.
Geography and geomorphology
Mount Berlin lies in
Marie Byrd Land,
West Antarctica,[3] 100 kilometres (62 mi) inland[4] from the
Hobbs Coast of the
Amundsen Sea.[5] The volcano was studied during
field trips in December 1940, November 1967, November–December 1977[6] and 1994–1995.[7] It is named after Leonard M. Berlin, who led the 1940 research visit to the mountain.[6]
Mount Berlin reaches a height of 3,478 metres (11,411 ft) above sea level,[3][8] making it the highest volcano in the
Flood Range.[9] It is the western end of the range;[10]Wells Saddle separates it from
Mount Moulton volcano farther east.[8] Mount Berlin's peak is 2.1 kilometres (1.3 mi)[11] above the highest local elevation of the
West Antarctic Ice Sheet.[12][b] The
summit crater (Berlin Crater) is 2 kilometres (1.2 mi) wide[15] and has sharply defined,[16] ice-crowned edges;[17] the highest point of the volcano is on the southeastern margin.[18] Mount Berlin consists of two overlapping edifices: Mount Berlin proper and
Merrem Peak 3.5 kilometres (2.2 mi) west-northwest.[9] Merrem Peak is about 3,000 metres (9,800 ft) high and has a 2.5-by-1-kilometre-wide (1.55 mi × 0.62 mi) crater at its summit.[19] These craters are aligned east–west, like other Flood Range
calderas.[20] Mount Berlin has variously been described as a
composite volcano,
shield volcano or
stratovolcano[21] with a volume of about 200 cubic kilometres (48 cu mi).[9] The entire combined edifice has a length of about 20 kilometres (12 mi).[22] Its slopes have inclinations of about 12–13°.[9]
The volcano is covered by
glaciers, resulting in only a few rocky outcrops being visible on the mountain.[23][24] Despite this, the volcano is considered to be well-exposed in comparison to other volcanoes in the region.[6]Monogenetic volcanoes on the northern flank of Mount Berlin have generated two outcrops of
mafic lava and
scoria,[25] one of which is found at
Mefford Knoll[26][10] on a linear vent.[27] On the southeastern flank, a
fiamme-rich
ignimbrite crops out[25] and is correlated to a flank vent on the northeastern flank.[19] A ridge extends northwestward from Merrem Peak; at its foot is
Brandenberger Bluff,[8] a 300-metre-high (980 ft) outcrop of lava and tuff. This structure formed
phreatomagmatically; it was formerly interpreted as a subglacial
hyaloclastite.[19] Other topographical locations on Mount Berlin are
Fields Peak on the northern flank,
Kraut Rocks at the west-southwestern foot,
Walts Cliff on the northeastern flank and
Wedemeyer Rocks at the southern foot.[8][10] The existence of
tuyas has been reported from Mount Berlin.[28] According to a 1972 report,
tephra overlies ice at some sites.[17] Nonvolcanic features include incipient
cirques on the northern and western side.[4]
Geology
The
Marie Byrd Land Volcanic Province features 18
central volcanoes and accompanying
parasitic vents,[29] which form islands off the coast or
nunataks in the ice.[3] Many of these volcanoes form distinct volcanic chains, such as the
Executive Committee Range where volcanic activity has shifted westward at a rate of about 1 centimetre per year (0.4 in/year).[30] Such a movement is also apparent in the Flood Range, where activity migrated from Mount Moulton to Mount Berlin.[10] This movement appears to reflect the propagation of crustal fractures, as
plate motion is extremely slow in the region.[31] Volcanic activity appears to take place in three phases, an early
mafic phase, often followed by a second
felsic phase. End-stage volcanism occurs in the form of small cone-forming eruptions.[32] Ignimbrites are rare in Marie Byrd Land; the outcrop on the southeastern flank of Mount Berlin is an uncommon exception.[25]
Activity in the Marie Byrd Land Volcanic Province began during the middle
Miocene and continued into the later
Quaternary;
argon-argon dating yielded ages as young as 8,200 years.[33] Four volcanoes in the Marie Byrd Land Volcanic Province – Mount Berlin,
Mount Siple,
Mount Takahe and
Mount Waesche – were classified as "possibly or potentially active" in the 1990 Antarctic Research Series by LeMasurier et al., and active
subglacial volcanoes have been identified on the basis of aerophysical surveys.[34]
The volcanic province is related to the
West Antarctic Rift[33] which is interpreted as a
rift[35] or as a
plate boundary. The West Antarctic Rift has been volcanically and tectonically active over the past 30–25 million years. The
basement crops out near the coast and consists of
Paleozoic rocks with intruded
Cretaceous and
Devoniangranites which were flattened by erosion, leaving a Cretaceous erosion surface on which volcanoes rest.[36] The volcanic activity at Mount Berlin may ultimately relate to the presence of a
mantle plume that is impinging onto the
crust in Marie Byrd Land.[37]
Local deposits
Two[16]pyroclastic fallout deposits crop out in the crater rim, reaching thicknesses of 150 metres (490 ft). Other outcrops of fallout deposits occur at Merrem Peak.[15] The Mount Berlin deposits reach thicknesses of more than 70 metres (230 ft) close to the crater, diminishing to 1 metre (3 ft) at Merrem Peak. They were formed by pyroclastic fallout during eruptions, which mantled the topography. As eruption characteristics changed, these processes generated distinct deposits.
Tuff deposits containing
lapilli and
volcanic ash-rich pyroclastic deposits in the crater rim were erupted during
hydromagmatic events.[25]
Some lava flows feature
levee-like forms at their margins.[15] In the past, certain fallout deposits in the crater rim were thought to be lava flows.[38]Hyalotuff,[39]obsidian and
pumice have been recovered from Mount Berlin.[34] Both welded and unwelded pyroclastic and tuffaceous
breccias are present. They consist of
lava bombs,
lithic rocks, obsidian fragments and pumice.[25] Hyaloclastite occurs around the base of Mount Berlin.[40]
The
magma erupted from Mount Berlin appears to have originated in the form of discrete small batches[45] rather than in one large
magma chamber.[24] The composition of volcanic rocks varied between eruptions[25] and probably also during different phases of the same eruption.[46] Phonolite was erupted early during volcanic evolution and followed by trachyte during the Quaternary.[47] A long-term trend in
iron and
sulfur of the tephras may indicate a tendency towards more primitive magma[c] compositions.[49]
Eruption history
Mount Berlin was active from the
Pliocene into the
Holocene.[1] The oldest parts are found at Wedemeyer Rocks[10] and Brandenberger Bluff and are 2.7 million years old. Activity then took place at Merrem Peak between 571,000 and 141,000 years ago; during this phase eruptions also occurred on the flanks of Mount Berlin. After 25,500 years ago activity shifted to Mount Berlin proper[19] and the volcano grew by more than 400 metres (1,300 ft).[44] Over time, volcanic activity on Mount Berlin has moved in a south-southeast direction.[39]
Eruptions of Berlin include both
effusive eruptions, that emplaced
cinder cones and
lava flows,[18] and intense
explosive eruptions (
Plinian eruptions[50])[51] which generated
eruption columns up to 40 kilometres (25 mi) high. Such eruptions would have injected tephra into the
stratosphere[d] and deposited it across the southern
Pacific Ocean and the
West Antarctic Ice Sheet.[53] The patterns of tephra deposition indicate that westerly winds transported tephra from Mount Berlin over Antarctica.[54] During the last 100,000 years Mount Berlin has been more active than Mount Takahe, the other major source of tephra in the West Antarctic, but activity at Berlin was episodic rather than steady.[55] The volcano underwent a surge in activity between 35,000/40,000 and 18,000/20,000 years ago.[56][49] Despite their size, the eruptions at Mount Berlin did not significantly impact the climate.[57]
The eruption history of Mount Berlin is recorded in outcrops on the volcano, in a
blue-ice area on
Mount Moulton,[e] 30 kilometres (19 mi) away,[59] at Mount Waesche, in ice cores[f][53] and in marine
sediment cores[61] from the
Southern Ocean.[62] Several tephra layers found in ice cores all across Antarctica have been attributed to West Antarctic volcanoes and in particular to Mount Berlin.[63][64] Tephras deposited by this volcano have been used to date[g] ice cores,[68] establishing that ice at Mount Moulton is at least 492,000 years old and thus the oldest ice of West Antarctica.[69] Dusty layers in ice cores have also been linked to Mount Berlin and other volcanoes in Antarctica.[70]
141,600±7,500 years ago, recorded at Mount Moulton.[19] It may correspond to a 141,400±5,400 years old deposit at Merrem Peak.[58] A 141,700-year-old tephra layer at Vostok has been related to this Mount Moulton tephra.[50]
The Marine Tephra B, which has been identified in marine
sediment cores and the Dome Fuji ice core, was erupted by Mount Berlin 130,700±1,800 years ago. It is used as a
stratigraphic marker for the transition between
marine isotope stages 6 and 5.[72]
118,700±2,500 years ago, recorded at Mount Moulton[19] and potentially also at
Talos Dome.[73] Correlated deposits at
Siple Ice Dome indicate that this eruption was intense and deposited tephra over large areas.[46]
106,300±2,400 years ago, recorded at Mount Moulton.[19]
92,500±2,000 and 92,200±900 years ago, as dated by argon-argon dating of its deposits around Mount Berlin.[59] A tephra layer in
Dome C and
Dome Fuji ice cores recovered during
European Project for Ice Coring in Antarctica and dated to be 89,000–87,000 years old[74] has been attributed to this eruption on the basis of its composition.[59][75] The nature of the
trachytic tephra layer indicates that it was produced during an intense, multiphase eruption[74] which may have led to compositional differences between deposits emplaced close and these emplaced far from the volcano.[59] Deposits from this eruption have also been found in the
Amundsen Sea, the
Bellingshausen Sea,[76] at a Vostok ice core and in marine sediments of the
continental margin of West Antarctica ("tephra A"[77][78]).[56]
A 28,500-year-old tephra layer at
Mount Erebus and in two ice cores of the West Antarctic Ice Sheet.[79]
27,300±2,300 years ago, recorded at Mount Moulton.[19]
Ages of 25,500±2,000 years ago have been obtained from two lower welded pyroclastic units[38] that crop out within Mount Berlin crater.[44]
Unwelded obsidian fallout units that crop out in Mount Berlin crater have been dated to be 18,200±5,800 years old.[38]
14,500±3,800 years ago, recorded at Mount Moulton.[19]
A lava flow and tephra layers found both close to and away from Mount Berlin appear to have been produced during an extended eruption about 10,500±2,500 years ago.[80]
9,718
BP, as dated in the
Siple Dome A ice core.[81] A
lava flow on Mount Berlin and tephras at Mount Moulton have a similar composition though no exact match has been found.[82]
Several tephra layers between 18,100 and 55,400 years old, found in Siple Dome ice cores, resemble those of Mount Berlin,[83] as do tephras emplaced 9,346[82] and 2,067
BCE (interval 3.0 years) in the Siple Dome A ice core.[81] The marine "Tephra B" and "Tephra C" layers may also come from Mount Berlin but statistical methods have not supported such a relationship[84] at least for "Tephra B".[78] A 694±7
before present tephra layer found in the TALDICE ice core in East Antarctica may come from Mount Berlin or from
Mount Melbourne[85] and may have been erupted at the same time as an eruption of
The Pleiades.[86]
Mount Berlin is
geothermally active, the only volcano in Marie Byrd Land with such activity.[39] Steaming
ice towers are found[34][27] on the western and northern rim of Berlin Crater.[92] Their existence was first reported in 1968; ice towers form when
fumarole exhalations freeze in the cold Antarctic atmosphere[93] and are a characteristic trait of Antarctic volcanoes.[92]ASTER satellite imaging has not detected these fumaroles,[94] presumably because they are hidden within the ice towers.[95] A more than 70-metre-long (230 ft)
ice cave begins at one of these ice towers; temperatures of over 12 °C (54 °F) have been recorded on the cave floor.[38] These geothermal environments may host geothermal habitats similar to those in
Victoria Land and at
Deception Island, but Mount Berlin is remote and has never been studied in this regard.[96] It has been evaluated for the potential to obtain
geothermal power; being isolated and extensively covered with ice, these volcanoes are unlikely to have any significant economic value as geothermal resources.[87]
^Tephra are volcanic rocks formed from fragments generated during explosive eruptions.[2]
^Which reaches an elevation of 1,400 metres (4,600 ft) here[13] and piles up against the volcano, resulting in a 800 metres (2,600 ft) height difference between the northern and southern flanks of Mount Berlin.[14]
^Primitive magmas are magmas that haven't undergone significant differentiation, e.g through the interaction with the
crust, yet.[48]
^A process facilitated by the low height of the
tropopause over Antarctica.[52]
^At Mount Moulton about 40 tephra layers linked to Mount Berlin have been identified[7] although some of these tephra layers may have been erupted by Mount Moulton.[41] Not all of these tephra layers correspond to known eruption deposits on Mount Berlin,[38] perhaps due to burial beneath younger eruptions; and not all eruptions of Mount Berlin are recorded at Mount Moulton, perhaps due to erosion by wind or due to winds transporting tephra elsewhere.[58]
^Some of the tephra layers in the
Byrd Station ice core were originally interpreted as being products of
Mount Takahe.[60]
^Tephra layers from volcanoes can be used to date
ice cores in
Antarctica. Accurate dating is important for the correct interpretation of the wealth of environmental data in ice cores.[65] Traces of volcanic activity in ice cores allow reconstructions of the effect that volcanic activity had on climate.[66] Dating the age of ice also has implications for forecasting the future development of the
West Antarctic Ice Sheet under
anthropogenic global warming, as it has been hypothesised that this ice sheet collapsed during the
marine isotope stage 5interglacial; finding ice older than this in the West Antarctic Ice Sheet would falsify the hypothesis.[67]
González-Ferrán, Oscar; González-Bonorino, Felix (1972). "The volcanic ranges of Marie Byrd Land between long. 100 and 140 W.". Antarctic Geology and Geophysics. Vol. 261. Oslo: Universitetsforlaget.
LeMasurier, W. E.; Rex, D. C. (1989). "Evolution of linear volcanic ranges in Marie Byrd Land, West Antarctica". Journal of Geophysical Research. 94 (B6): 7223.
Bibcode:
1989JGR....94.7223L.
doi:
10.1029/JB094iB06p07223.