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词条 Hjort Trench
释义

  1. Geomorphology

  2. Incipient subduction

  3. See also

  4. References

{{Location map | Oceania |relief=yes | lat_deg=57.00 | lat_dir=S | lon_deg = 157.5 | lon_dir=E}}The Hjort Trench is a linear topographic depression south of Macquarie Island in the southwest Pacific Ocean.[1][2] Geologically, the depression is considered to be the seafloor expression of an ocean-ocean subduction zone, where the Australian plate is thrusting beneath the Pacific Plate.[3] As the southernmost portion of the Macquarie Ridge Complex, the Hjort Trench lies in an area of diagonal convergence produced by the transform fault evolution of the Emerald Fracture Zone. Frequent seismic events, most less than 20 km deep, characterize the transpression along this plate boundary.[4]

Geomorphology

The deepest point of Hjort trench is approximately 6.3 km below sea level. To the east, the Hjort ridge follows the general curve of the trench, separating the trench from the Hjort Plateau.

Incipient subduction

The Hjort trench lies in an area of transpression where the plate boundary transitions from a transform boundary to a convergent one. As such, this region provides an example of how a transform boundary with a vertical or near-vertical transform fault becomes an area of under-thrusting.[3]

See also

  • Macquarie Triple Junction
  • Oceanic trench

References

[5][6]
1. ^{{cite journal |url=http://agris.fao.org/agris-search/search.do?recordID=AV20120112066 |title=SEASAT geoid anomalies and the Macquarie Ridge complex [1985] |publisher=Food and Agriculture Organization of the United Nations |website=agris.fao.org |year=1985 |last1=Cazenave |first1=Anny |last2=Ruff |first2=Larry }}
2. ^{{cite web |url=https://data.gov.au/dataset/seafloor-mapping-of-the-south-east-region-and-adjacent-waters-austrea-2-cruise-report-south-eas |title=Seafloor Mapping of the South-east Region and Adjacent Waters : AUSTREA-2 Cruise Report: South-east of Tasmania and Southern Macquarie Ridge |publisher=Government of Australia |website=data.gov.au }}
3. ^1 {{cite journal |last1=Meckel |first1=T.A. |last2=Coffin |first2=M.F. |last3=Mosher |first3=S |last4=Symonds |first4=P |last5=Bernardel |first5=G |last6=Mann |first6=P |title=Underthrusting at the Hjort Trench, Australian‐Pacific plate boundary: Incipient subduction? |journal=Geochemistry, Geophysics, Geosystems |date=6 December 2003 |volume=4 |issue=12 |pages=1099 |doi=10.1029/2002GC000498 |bibcode=2003GGG.....4.1099M }}
4. ^Lodolo, E. and F. Coren (1994). "The Westernmost Pacific Antarctic plate boundary in the vicinity of the Macquarie triple junction." (In C.A. Ricci, ed. Terra Antarctica, vol.1). pp. 158–161
5. ^{{cite journal |title=Underthrusting at the Hjort Trench, Australia-Pacific Plate Boundary: Incipient Subduction? |journal=AGU Fall Meeting Abstracts |volume=2002 |pages=T52A–1177 |bibcode = 2002AGUFM.T52A1177M|last1 = Meckel|first1 = T. A.|last2=Coffin |first2=M. F. |last3=Mosher |first3=S. |last4=Mann |first4=P. |last5=Symonds |first5=P. |last6=Bernardel |first6=G. |year=2002 }}
6. ^{{cite web |url=https://geographic.org/geographic_names/name.php?uni=-238653&fid=6437&c=undersea_features |title=Hjort Trench: Undersea Features |publisher=Geographical Names |website=geographic.org }}

3 : Plate tectonics|Macquarie Island|Oceanic trenches
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