Talk:Geology of Hainan Island

Feedback from YCYBenjamin

Hi Wlamwk, it's a really good page! I wanna go to Hainan now!

1. You can add more detail on how the oldest basement rocks (the come from 4000Ma ago) in Hainan was formed, it will make your page more complete when you explained the formation of other younger rocks. (try if there are researches done on it already)

2. You mentioned Hainan was part of the Gondwana, it will be good to add a map of Gondwana with Hainan on it to make things clear. Or you can even make more maps showing where Hainan is throughout earth history. (if you have time XD)

3. The cross-section diagrams are good. Make the diagram larger! Put it at the beginning or the end of sections. It seems better to me to do in this way (just my preference).

p.s. the satellite view of Hainan looks like a thin section under microscope XD — Preceding unsigned comment added by YCYBenjamin (talk • contribs) 21:34, 20 November 2017 (UTC)

Feedback from xaviertang

Hi Wlamwk,

1) You may consider adding more detailed localities to describe the formations, or in the other words, distribution of different types of rock on the island.

2) You may consider adding a real Geological Map of Hainan, just like https://wenku.baidu.com/view/f1a817b8804d2b160a4ec06d.html, after getting consent from relevant party.

3) You may consider providing an evolutionary animation to describe the evolution of geology of the Hainan island. (Though it is quite challenging and time-taking)

Hope you find my comments useful!

Xaviertang (talk) 10:01, 20 October 2017 (UTC)

Review by Jupiter

Hi Wlamwk.

Your page introduce the geology of Hainan Island. It is good to include a Satellite Image of Hainan Island at the beginning, and a Geological Time Scale in the "Geological Setting" section. The outline of the page is simple and clear, with Geological History ("Lithology and Geological Setting" section) with detailed sub-sections and "Structure" section.

Here are some suggestions:

1. In the "Lithology and Geological Setting" section, you discuss both the lithology and some geological history of the area. However, I found it is a bit confusing. For example, in "Precambrian" part, you first introduce "the Precambrian rock layers are not well exposed in Hainan Island ", and then mentioned about "tectonic evolution history of Hainan Island was proved to be different from that of the Cathaysia Block" and then describe the lithology. In your sub-sections, you also describe the lithology and geological events together. It may be better to separate that at least in paragraphs, for example:

Baoban Group

• The lithology of the Baoban Group generally showed

• During Paleoproterozoic and Mesoproterozoic, the Island....

2. Also, you may want to use some evolution diagrams to present the geological history. You do not need to show every tectonic event. A simple one showing the different environment, maybe in Precambrian, Paleozoic and Mesozoic, will be good enough.

3. For the Geological Time Scale, you may want to use it and add some notes to make it as a "Hainan Island Geological Time Scale". You can take a look at the page Geology_of_Tasmania. There is an approximate time-scale of Tasmania, which you may want to take it as reference.

4. A geological map will be effective to present the localities of the formations and geological history.

Generally, I think the page is informative. Diagrams, "Hainan Island Geological Time Scale" and geological map may be useful in presenting the geology of the area. A better structure in paragraphs may also help people to follow your page easily. As the readers may have no geological background, it may be confusing to have multiple focus within a single paragraph. Jupmira104(talk)

Feedback from karaclc

Hi there,

1. In terms of structure, you may add what's the tectonic setting of Hainan. For example, is it caused by collision of 2 plate? What causes them and provide evidences(shear zone) as well.

2. Adding evolutionary 3-D geological setting of Hainan is another thing that you can add under geological setting.

3. You may also add a section of economic geology. like do Hainan has any archaeological finds to do with the rocks found in certain period of time. I would find this page more interesting if some history of this aspect can be mentioned. — Preceding unsigned comment added by Karaclc (talk • contribs) 04:30, 23 October 2017 (UTC)

Review from GeoJeremy

Hi Wlamwk,

Here are my opinions. Hope it helps.

1)Wordings Some wordings in a few sentences seems to be a bit strange. For example, you wrote in Jurassic and Cretaceous sub-section "five lithostratigraphic units which were lying comfortably on each other in geological sequence". Do you mean "conformably" instead of "comfortably"? Also, the word "treking" in the third sentence of the paragraph under "Geology of Hainan Island" section.

2)Geological reasoning You wrote "granites, andesites, dacites, rhyolites, and mafic dykes, etc" which, I suppose, refers to the "five lithostratigraphic units" in the previous sentence. I am just curious, but it is quite rare that intrusive rocks such as granites for stratigraphic units. Would it be necessary to explain more in your paragraph? Or am I misunderstanding your paragraph?

3)Pictorial presentation Is there any geological or schematic maps to show the location and exposure of different units on Hainan Island? It would be easier to piece together the information you provided. Or maybe stratigraphic logs? But I understand there may be copyright issues on this matter.

GeoJeremy (talk) 14:18, 23 October 2017 (UTC)

Feedback from dinohk

1. I would suggest adding some biostratigraphic information. What kind of fossils are present in this locality and maybe a quick description of the paleoenvironment.

2. What is the significance of Hainan island? Is it a particularly good example of some type of structural geology or show high abundance of some mineral? It would be more engaging to explain to the reader why they should be interested in this area.

3. Since you go into some detail about the lithology of the island, I think it would be beneficial to include some images of some of the formations you are talking about. — Preceding unsigned comment added by Dinohk (talk • contribs) 15:04, 23 October 2017 (UTC)

Review by Graeme Bartlett

I am happy with your topic, as it is something that I would have liked to have written about myself! My suggestions:

• On the timeline, customise it to include import events in the geological history.
• I am confused as to whether Hainan is part of Cathaysia Block or not, as under "Precambrian" it suggests is has a different history.
• Can you tell us more about the Late Cretaceous to Cenozoic volcanism?
• Are there any minerals discovered there or famous there?
• Can you include a geological map showing the formations etc that you describe?
• Are the diagrams showing the strata (like http://www.southampton.ac.uk/~imw/jpg-Lulworth/5LC-lullog-succession-m.jpg)?
• Is there any mining or quarrying worth writing about?
• Is there any geophysical information? For example is the island under stress at the moment? How thick is the Crust and Lithosphere? Where is it moving? etc

Graeme Bartlett (talk) 06:14, 24 October 2017 (UTC)

Feedback from Tamjwh

Hi Wlamwk,

Your page is very informative and well structured, and I particularly like the geological time scale which summarizes the different rock types and environments throughout Hainan Island’s history. And here are some suggestions:

• The description is good and comprehensive, but it has too much information in some paragraphs which makes it sometimes difficult to picture the whole geological evolution. It is understandable that you put the lithology and geological setting together to explain various events in a geological period, but I think it would be easier for readers to capture the key features if the lithology and geological settings/events can be separated into two explicit parts, if possible.
• Explanation in the sub-section Cambrian (488 – 542 million years ago) could be improved. You mentioned about trilobite fossils in Hainan are associated with Queensland, Australia, but wonder why the index fossil trilobite would indicate tectonic movement in Cambrian? Is there any other evidence showing the tectonic event?
• Hainan has a number of profitable natural earth resources. The content would be more comprehensive if the economic geology of Hainan is also outlined in a section.

Tamjwh (talk) 05:07, 20 November 2017 (UTC)

Feedback from Jupiter 20171120

It is good to include a simple geological map with an satellite image of Hainan Island at the beginning. And it is also much better to show the labelled geological timeline corresponding to the text and subtitle, compare to the previous version. One suggestion is about the size of the cross sections. You may want to enlarge the size. The words are too small to read on the page. Apart from this, I think it is generally a good page about the geology of Hainan Island. — Preceding unsigned comment added by Jupmira104 (talk • contribs) 16:51, 20 November 2017 (UTC)

Review from Dinohk

While your page is informative in terms of the geological history of the island, it's still missing some important aspects such as the biostratigraphy or geological significance (ie mineral resources) — Preceding unsigned comment added by Dinohk (talk • contribs) 17:37, 21 November 2017 (UTC)

Removed from lead

The formation of continental basement of Hainan Island can probably be tracked even before Paleoproterozoic, and it was later reworked down the geological history.<ref name=":1">{{Cite journal|last=Zou, S., Yu, L., Yu, D., Xu, D., Ye, T., Wang, Z., ... & Liu, M.|first=|date=2017|title=Precambrian continental crust evolution of Hainan Island in South China: Constraints from detrital zircon Hf isotopes of metaclastic-sedimentary rocks in the Shilu Fe-Co-Cu ore district|url=|journal=Precambrian Research|volume=296|pages=195–207|via=|bibcode=2017PreR..296..195Z|doi=10.1016/j.precamres.2017.04.020}}</ref> zzz (talk) 22:07, 16 December 2017 (UTC)

Don't use ref formatting on talk pages. — LlywelynII 08:37, 23 January 2019 (UTC)

Vastly incomplete

so long as Hainan is sending people here for more detail about the province's geography. It doesn't even include the word "island".

In particular, even if there were a Geography of Hainan article, this article should still name the mountain chains and major mountains of the island. — LlywelynII 08:37, 23 January 2019 (UTC)