Draft:Palau-Kyushu Ridge: Difference between revisions

Source: Wikipedia, the free encyclopedia.
Browse history interactively
← Previous edit
Content deleted Content added
VisualWikitext
AfC-submit-wizard
Report bugs
. | Suggested by Jay8g | #UCB_toolbar
 
Line 10: Line 10:


== Formation ==
== Formation ==
The KPR is regarded as a remnant of the [[Izu–Bonin–Mariana Arc|proto Izu–Ogasawara (Bonin)–Mariana (IBM) island arc]] that was separated by [[Back-arc region|backarc]] spreading of the Shikoku and Parece Vela Basins in the late Eocene.<ref>{{Cite journal |last=Nishizawa |first=Azusa |last2=Kaneda |first2=Kentaro |last3=Oikawa |first3=Mitsuhiro |date=2016-02-26 |title=Crust and uppermost mantle structure of the Kyushu-Palau Ridge, remnant arc on the Philippine Sea plate |url=https://doi.org/10.1186/s40623-016-0407-3 |journal=Earth, Planets and Space |volume=68 |issue=1 |pages=30 |doi=10.1186/s40623-016-0407-3 |issn=1880-5981}}</ref>
The KPR is regarded as a remnant of the [[Izu–Bonin–Mariana Arc|proto Izu–Ogasawara (Bonin)–Mariana (IBM) island arc]] that was separated by [[Back-arc region|backarc]] spreading of the Shikoku and Parece Vela Basins in the late Eocene.<ref>{{Cite journal |last1=Nishizawa |first1=Azusa |last2=Kaneda |first2=Kentaro |last3=Oikawa |first3=Mitsuhiro |date=2016-02-26 |title=Crust and uppermost mantle structure of the Kyushu-Palau Ridge, remnant arc on the Philippine Sea plate |journal=Earth, Planets and Space |volume=68 |issue=1 |pages=30 |doi=10.1186/s40623-016-0407-3 |doi-access=free |bibcode=2016EP&S...68...30N |issn=1880-5981}}</ref>


The crustal thickness of the KPR reaches 12.0 km in the center, which gradually decreases to 5.0–6.0 km at sides.<ref>{{Cite journal |last=Niu |first=Xiongwei |last2=Tan |first2=Pingchuan |last3=Ding |first3=Weiwei |last4=Wang |first4=Wei |last5=Wei |first5=Yao |last6=Wei |first6=Xiaodong |last7=Ruan |first7=Aiguo |last8=Zhang |first8=Jie |last9=Wang |first9=Chunyang |last10=Tang |first10=Yong |last11=Li |first11=Jiabiao |date=2022-01-01 |title=Oceanic crustal structure and tectonic origin of the southern Kyushu-Palau Ridge in the Philippine Sea |url=https://doi.org/10.1007/s13131-021-1978-9 |journal=Acta Oceanologica Sinica |language=en |volume=41 |issue=1 |pages=39–49 |doi=10.1007/s13131-021-1978-9 |issn=1869-1099}}</ref> The velocity structure of the KPR is similar to the structures of the adjacent West Philippine Basin and Parece Vela Basin (PVB), indicating a typical oceanic crust2. Isostatic analysis shows that some regional compensation occurs during the loading of the KPR, which implies that the KPR was built mainly by magmatism during the splitting of the Izu-Bonin-Mariana arc and the following back-arc seafloor spreading of the PVB during 30–28 Ma BP2.
The crustal thickness of the KPR reaches 12.0 km in the center, which gradually decreases to 5.0–6.0 km at sides.<ref>{{Cite journal |last1=Niu |first1=Xiongwei |last2=Tan |first2=Pingchuan |last3=Ding |first3=Weiwei |last4=Wang |first4=Wei |last5=Wei |first5=Yao |last6=Wei |first6=Xiaodong |last7=Ruan |first7=Aiguo |last8=Zhang |first8=Jie |last9=Wang |first9=Chunyang |last10=Tang |first10=Yong |last11=Li |first11=Jiabiao |date=2022-01-01 |title=Oceanic crustal structure and tectonic origin of the southern Kyushu-Palau Ridge in the Philippine Sea |url=https://doi.org/10.1007/s13131-021-1978-9 |journal=Acta Oceanologica Sinica |language=en |volume=41 |issue=1 |pages=39–49 |doi=10.1007/s13131-021-1978-9 |bibcode=2022AcOSn..41a..39N |s2cid=245827067 |issn=1869-1099}}</ref> The velocity structure of the KPR is similar to the structures of the adjacent West Philippine Basin and Parece Vela Basin (PVB), indicating a typical oceanic crust2. Isostatic analysis shows that some regional compensation occurs during the loading of the KPR, which implies that the KPR was built mainly by magmatism during the splitting of the Izu-Bonin-Mariana arc and the following back-arc seafloor spreading of the PVB during 30–28 Ma BP2.


The absence of the thick middle crust (6.0–6.5 km/s) and high velocity lower-crustal layers (7.2–7.6 km/s) suggest that arc magmatism plays a less important role in the KPR formation2.
The absence of the thick middle crust (6.0–6.5 km/s) and high velocity lower-crustal layers (7.2–7.6 km/s) suggest that arc magmatism plays a less important role in the KPR formation2.

Latest revision as of 06:55, 7 March 2024


The Palau-Kyushu Ridge, also known as the Kyushu-Palau Ridge (KPR), is a massive undersea mountain range located in the Philippine Sea, stretching approximately 2,600 kilometers long in a north-south direction.[1] It's named after the two landmasses it flanks: the Japanese island of Kyushu to the north and the Micronesian island nation of Palau to the south.[2]

Formation

The KPR is regarded as a remnant of the proto Izu–Ogasawara (Bonin)–Mariana (IBM) island arc that was separated by backarc spreading of the Shikoku and Parece Vela Basins in the late Eocene.[3]

The crustal thickness of the KPR reaches 12.0 km in the center, which gradually decreases to 5.0–6.0 km at sides.[4] The velocity structure of the KPR is similar to the structures of the adjacent West Philippine Basin and Parece Vela Basin (PVB), indicating a typical oceanic crust2. Isostatic analysis shows that some regional compensation occurs during the loading of the KPR, which implies that the KPR was built mainly by magmatism during the splitting of the Izu-Bonin-Mariana arc and the following back-arc seafloor spreading of the PVB during 30–28 Ma BP2.

The absence of the thick middle crust (6.0–6.5 km/s) and high velocity lower-crustal layers (7.2–7.6 km/s) suggest that arc magmatism plays a less important role in the KPR formation2.

Geological features

From the view of geomorphologic features, the KPR is a discontinuous seamount chain (chain-shaped seamounts) and subduction beneath the Japanese Island arc at the Nankai Trough which is the natural boundary between the basin and the Japanese Island arc. At the positions of 25°N, 24°N, 23°N and 18°N, obvious discontinuity is shown, which belongs to natural topographic discontinuity.

References

  1. ISSN 1525-2027
    .
  2. ^ "Marine Regions · Kyushu-Palau Ridge (Ridge)". www.marineregions.org. Retrieved 2024-02-02.
  3. ISSN 1880-5981
    .
  4. S2CID 245827067
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Draft:Palau-Kyushu_Ridge&oldid=1212319618"